WO2020075858A1 - 通気筐体 - Google Patents
通気筐体 Download PDFInfo
- Publication number
- WO2020075858A1 WO2020075858A1 PCT/JP2019/040317 JP2019040317W WO2020075858A1 WO 2020075858 A1 WO2020075858 A1 WO 2020075858A1 JP 2019040317 W JP2019040317 W JP 2019040317W WO 2020075858 A1 WO2020075858 A1 WO 2020075858A1
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- WO
- WIPO (PCT)
- Prior art keywords
- ventilation
- protrusion
- housing
- ventilation assembly
- inner member
- Prior art date
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Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/0033—Moulds or cores; Details thereof or accessories therefor constructed for making articles provided with holes
-
- 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
- H05K5/0215—Venting apertures; Constructional details thereof with semi-permeable membranes attached to casings
-
- 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
- H05K5/06—Hermetically-sealed casings
- H05K5/068—Hermetically-sealed casings having a pressure compensation device, e.g. membrane
Definitions
- the present invention relates to a ventilation housing to which a ventilation assembly is fixed.
- the inside and outside of the housing for various electronic equipment such as lamps, inverters, converters, ECUs (Electronic Control Units), battery packs, radars, cameras, and other electronic equipment for home use, medical care, office use, etc.
- the ventilation assembly may be fixed to secure the ventilation of the device or reduce the pressure fluctuation inside the housing.
- the ventilation assembly has dust-proof properties that prevent dust from entering the housing, waterproof properties that prevent water from entering, and oil-proof properties that prevent oil from entering, depending on the specific electrical components to be fixed.
- Various properties such as oiliness and CCT resistance for preventing invasion of salt are required.
- Patent Document 1 discloses a ventilation assembly capable of satisfying the breathability and various required properties.
- the ventilation assembly disclosed in Patent Document 1 is shown in FIG.
- the ventilation assembly 101 shown in FIG. 28 includes an inner member 102 that is a tubular body having openings at both ends 108 and 109, and a ventilation membrane 103 that covers the opening at one end 108 of the inner member 102. And an external member 104 that is a cylindrical body at the bottom.
- the outer member 104 is joined to the inner member 102 in a state where the inner member 102 is inserted from the end 108 side inside the outer member 104.
- the outer member 104 includes a protrusion 106 protruding from the inner surface 105 of the bottom in a direction along the central axis of the ventilation assembly 101.
- the protrusion 106 is in contact with the gas permeable membrane 103 arranged at the end 108 of the internal member 102.
- the ventilation assembly 101 includes a space 107 serving as a ventilation path 115 that connects the outside of the ventilation assembly 101 and the ventilation membrane 103, between the inner surface 105 of the bottom of the outer member 104 and the ventilation membrane 103, and the outer peripheral surface of the inner member 102. And the inner peripheral surface of the outer member 104.
- the ventilation assembly 101 is fixed to a cylindrical protrusion 112 that extends from the outer surface of the housing 111 and has a space 110 inside that communicates the inside and outside of the housing 111. More specifically, the ventilation assembly 101 is fixed to the protrusion 112 by inserting the protrusion 112 into the inner member 102 through the opening at the other end 109 of the inner member 102. With the ventilation assembly 101 fixed, ventilation can be performed inside and outside the housing 111 through the protrusion 112 and the ventilation assembly 101.
- the present invention relates to a ventilation housing including a housing and a ventilation assembly, which has excellent moisture permeability inside and outside of the housing and can prevent the ventilation assembly from falling off from a protrusion of the housing. For the purpose of providing.
- a vented housing comprising a housing and a vent assembly, comprising:
- the housing includes a cylindrical protrusion that extends from the outer surface of the housing and has a first space inside that communicates the inside and the outside of the housing,
- the vent assembly is An internal member that is a tubular body having openings at both ends, A ventilation film covering the opening at one of the ends of the internal member, A bottomed tubular body, the internal member is inserted from the side of the one end portion inside, an external member that is joined to the internal member in the inserted state,
- the protrusion is inserted into the opening at the other end of the inner member, and is fixed to the protrusion in a state where the inner peripheral surface of the inner member and the outer peripheral surface of the protrusion are in contact with each other.
- the vent assembly connects the vent membrane and the exterior of the vent assembly to at least one selected from inside the inner member, inside the outer member, and between the joined inner and outer members.
- the height H1 of the internal member is 6.0 mm or more and 10 mm or less
- a ratio H1 / H2 of the height H1 of the internal member to the height H2 of the protrusion is 1.00 or more and 1.70 or less
- a ventilation housing I will provide a.
- the ventilation housing in which the height of the internal member and the ratio of the height of the internal member to the height of the protrusion are controlled as described above exhibits excellent moisture permeability. Also, if the ventilation assembly is simply made thin, the ventilation assembly will easily fall off the protrusions of the housing, but the ventilation housing controlled as described above can prevent the ventilation assembly from falling off the protrusions of the housing. it can.
- FIG. 1A is a cross-sectional view schematically showing the ventilation assembly according to the first embodiment.
- FIG. 1B is a sectional view schematically showing the ventilation assembly according to the first embodiment.
- FIG. 2 is an exploded perspective view schematically showing the ventilation assembly according to the first embodiment.
- FIG. 3A is a sectional view schematically showing the ventilation assembly according to the second embodiment.
- FIG. 3B is a sectional view schematically showing the ventilation assembly according to the second embodiment.
- FIG. 4 is an exploded perspective view schematically showing the ventilation assembly according to the second embodiment.
- FIG. 5A is a sectional view schematically showing the ventilation assembly according to the third embodiment.
- FIG. 5B is a cross-sectional view schematically showing the ventilation assembly according to the third embodiment.
- FIG. 6 is an exploded perspective view schematically showing the ventilation assembly according to the third embodiment.
- FIG. 7A is a sectional view schematically showing the ventilation assembly according to the fourth exemplary embodiment.
- FIG. 7B is a sectional view schematically showing the ventilation assembly according to the fourth exemplary embodiment.
- FIG. 8 is an exploded perspective view schematically showing the ventilation assembly according to the fourth embodiment.
- FIG. 9A is a sectional view schematically showing the ventilation assembly according to the fifth exemplary embodiment.
- FIG. 9B is a sectional view schematically showing the ventilation assembly according to the fifth exemplary embodiment.
- FIG. 10 is an exploded perspective view schematically showing the ventilation assembly of the fifth embodiment.
- FIG. 11A is a perspective view schematically showing the ventilation assembly manufactured in the example.
- FIG. 11B is a perspective view schematically showing an external member included in the ventilation assembly of FIG. 11A.
- FIG. 12A is a plan view schematically showing a housing lid used for evaluation of the moisture permeability (moisture permeability) of the ventilation housing. 12B is a schematic diagram showing a cross section of the housing lid of FIG. 12A.
- FIG. 13A is a perspective view schematically showing the ventilation assembly manufactured in the example.
- FIG. 13B is a perspective view schematically showing an external member included in the ventilation assembly of FIG. 13A.
- FIG. 14 is a graph plotting the relationship between the water vapor transmission rate and the ventilation distance for Examples 1 to 4 and Comparative Examples 1 to 9.
- FIG. 15A is a perspective view schematically showing the ventilation assembly manufactured in the example.
- FIG. 15B is a perspective view schematically showing an external member included in the ventilation assembly of FIG. 15A.
- FIG. 16A is a perspective view schematically showing the ventilation assembly manufactured in the example.
- 16B is a perspective view schematically showing an external member included in the ventilation assembly of FIG. 16A.
- FIG. 17A is a perspective view schematically showing the ventilation assembly manufactured in the example. 17B is a perspective view schematically showing an external member included in the ventilation assembly of FIG. 17A.
- FIG. 18 is a diagram showing an image used for measuring the area S2 min for the ventilation assembly manufactured in the example.
- FIG. 19 is a diagram showing an image used for measuring an area S2 out for the ventilation assembly manufactured in the example.
- FIG. 20 is a diagram showing an image after the binarization processing used for measuring the area S2 out for the ventilation assembly manufactured in the example.
- FIG. 21 is a graph plotting the relationship between the ratio S2 out / S1 and the water vapor transmission rate for Examples 5 to 9.
- FIG. 22 is a schematic diagram for explaining the pull-out test of the internal member.
- FIG. 23 is a graph showing the SS curve obtained in the pull-out test of the internal member.
- FIG. 24 is a graph plotting the relationship between the ratio H1 / H2 and the pulling force for Examples and Comparative Examples in which the internal member was pulled out without being damaged during the pulling-out test of the internal member.
- FIG. 25 is a graph showing the SS curve obtained in the pull-out test of the external member.
- FIG. 26 is a graph in which the relationship between the insertion depth of the external member and the drawing force is plotted for the reference example.
- FIG. 27 is a graph in which the relationship between the insertion depth of the external member and the water vapor transmission rate is plotted for Comparative Examples 1 to 3.
- FIG. 28 is sectional drawing which shows an example of the conventional ventilation assembly typically.
- the ventilation housing is A vented housing comprising a housing and a vent assembly, comprising:
- the housing includes a cylindrical protrusion that extends from the outer surface of the housing and has a first space inside that communicates the inside and the outside of the housing,
- the vent assembly is An internal member that is a tubular body having openings at both ends, A ventilation film covering the opening at one of the ends of the internal member, A bottomed tubular body, the internal member is inserted from the side of the one end portion inside, an external member that is joined to the internal member in the inserted state,
- the protrusion is inserted into the opening at the other end of the inner member, and is fixed to the protrusion in a state where the inner peripheral surface of the inner member and the outer peripheral surface of the protrusion are in contact with each other.
- the vent assembly connects the vent membrane and the exterior of the vent assembly to at least one selected from inside the inner member, inside the outer member, and between the joined inner and outer members.
- the height H1 of the internal member is 6.0 mm or more and 10 mm or less
- a ratio H1 / H2 of the height H1 of the internal member to the height H2 of the protrusion is 1.00 or more and 1.70 or less.
- the ventilation housing of the first aspect in the ventilation housing of the first aspect, The cross-sectional area S1 of the first space cut by a plane perpendicular to the central axis of the protrusion and the cross-sectional area of the second space cut by a plane perpendicular to the ventilation direction as the ventilation path.
- the ratio S2 min / S1 to the total area S2 min at the position where the total area totaled for each distance from the film is the minimum is 1.0 or more.
- the ventilation housing according to the first or second aspect When the cross-sectional area S1 of the first space cut by a plane perpendicular to the central axis of the protrusion and the second space from the other end side along the central axis of the ventilation assembly are observed. , The ratio S2 out / S1 of the total area S2 out of the plane representing the cross section at the position where the second space is the narrowest is 1.0 or more.
- the ventilation housing In the ventilation housing according to any one of the first to third aspects, When observed in a direction perpendicular to the central axis of the ventilation assembly, The length of the portion of the inner member covered by the outer member in the direction along the central axis is 6.0 mm or more and 8.0 mm or less.
- the outer member and / or the inner member has a locking mechanism that detachably joins the outer member and the inner member.
- FIGS. 1A and 1B show a cross-section BB of the ventilation assembly 1A shown in FIG. 1A.
- FIG. 1A shows a cross section AOA of the ventilation assembly 1A shown in FIG. 1B.
- the “O” in FIG. 1B is the central axis of vent assembly 1A. 1A and 1B, the ventilation assembly 1A is fixed to the projection 52 of the housing 51, in other words, the vicinity of the projection 52 in the ventilation housing in which the ventilation assembly 1A is fixed to the projection 52 of the housing 51, It is shown.
- An exploded perspective view of the ventilation assembly 1A shown in FIGS. 1A and 1B is shown in FIG. As shown in FIG.
- the ventilation assembly 1A has a tubular shape having a first space 59 inside which extends from the outer surface 53 of the housing 51 and extends and communicates the inside and outside of the housing 51. It is fixed to the protrusion 52.
- the ventilation assembly 1A includes an inner member 2, a gas permeable membrane 3, and an outer member 4.
- the inner member 2 is a tubular body having openings 12A and 12B at both ends 11A and 11B.
- the inner member 2 has an open tube structure in which both ends are open.
- the gas permeable membrane 3 is arranged at the one end 11A of the inner member 2 so as to cover the opening 12A at the one end 11A.
- the outer member 4 is a cylindrical body having a bottom.
- the outer member 4 has a closed pipe structure in which one end 42 is an opening and the other end is a closed end closed by the bottom 32.
- the outer member 4 is joined to the inner member 2 in a state where the inner member 2 is inserted inside the outer member 4 from the side of the end portion 11A where the gas permeable membrane 3 is arranged.
- the inner side of the outer member 4 means a space surrounded by the opening of the outer member 4 and the inner peripheral surface 31.
- the external member 4 functions as a cover member that protects the gas permeable membrane 3 from foreign matter such as dust and water flying from the outside.
- the ventilation assembly 1A has a second space 5 serving as a ventilation path that connects the ventilation film 3 and the outside of the ventilation assembly 1A. Further, the ventilation assembly 1A has a space 5a, which is a part of the second space 5, between the outer peripheral surface 40 of the outer member 4 joined to the inner member 2 and the inner peripheral surface 13 of the inner member 2. are doing.
- the ventilation assembly 1A has a space 5a between the joined inner member 2 and outer member 4, more specifically, between the inner peripheral surface 31 of the outer member 4 and the outer peripheral surface 19 of the inner member 2. There is. Further, in the ventilation assembly 1A, the inner surface 33 of the bottom portion 32 of the outer member 4 and the ventilation film 3 are separated from each other.
- the ventilation assembly 1A also has a space 5b that is a part of the second space 5 between the inner surface 33 and the ventilation film 3 that are separated from each other.
- the “ventilation path” is a path through which gas can move between the ventilation membrane and the outside of the ventilation assembly. For example, air that has permeated the ventilation membrane 3 and reached the space 5b passes from the space 5b to the space 5a. It means a path of gas that can finally reach the outside of the ventilation assembly 1A. Therefore, a space such as the space 5a can be a "ventilation path" not only between the joined inner member 2 and outer member 4 but also inside the inner member 2 or inside the outer member 4. Note that the ventilation path is determined as a reference for the one formed when the outer member 4 is inserted into the inner member 2 as far as possible.
- the protrusion 52 is inserted into the inner member 2 through the opening 12B at the other end 11B of the inner member 2, and the inner peripheral surface 13 of the inner member 2 and the outer peripheral surface 58 of the protrusion 52 are in contact with each other. Is fixed to the protrusion 52 of the housing 51.
- the ventilation assembly 1A is fixed, the protrusion 52 is inserted into the through hole 14 of the inner member 2.
- the through hole 14 is a space that is surrounded by the inner peripheral surface 13 of the internal member 2 and that connects the end portion 11A and the end portion 11B.
- the housing is provided via the first space 59 inside the projection 52, the through hole 14 of the internal member 2, the ventilation film 3, and the second space 5. Ventilation inside and outside 51 can be secured.
- the thickness T1 which is the distance between the inner peripheral surface 13 and the outer peripheral surface 19 of the inner member 2, may be 1.0 mm or more and 3.0 mm or less.
- the lower limit of the thickness T1 may be 1.1 mm or more, 1.2 mm or more, and further 1.3 mm or more.
- the upper limit of the thickness T1 may be 2.9 mm or less, 2.8 mm or less, and further 2.7 mm or less.
- the ventilation assembly 1 can be made thin, but sufficient strength as the inner member 2 is ensured.
- the outer member 4 is joined to the inner member 2. It is possible to prevent damage and tearing when doing.
- the thickness T1 is determined based on the state before the internal member 2 is inserted into the protrusion 52.
- the thickness T1 is reduced from the end portion 11B into which the protrusion 52 is inserted when fixing the ventilation assembly 1A to a certain height in the direction along the central axis O. It has a thin portion 15.
- the inner member 2 has a step 16 at the boundary between the thin portion 15 and the other portions. The step 16 is located farther from the outer surface 53 of the housing 51 than the opening-side end 42 of the external member 4 (located above the ventilation assembly 1A as compared to the end 42).
- the position of the step 16 is not limited to this example. According to the internal member 2 having the thin portion 15, the ventilation assembly 1A can be more easily inserted into the protrusion 52 of the housing 51.
- This effect is particularly advantageous when the inner diameter of the inner member 2 is small due to thinning or the like, in other words, when the end portion 11B of the inner member 2 is difficult to spread when the inner member 2 is inserted into the protrusion 52. Further, the inner member 2 does not have the thin portion 15 on the side of the end portion 11A on which the gas permeable membrane 3 is arranged, so that both members 2, 4 when the outer member 4 is joined to the inner member 2 are formed. It is possible to prevent an inclination between them and an inclination of the internal member 2 when the internal member 2 is inserted into the protrusion 52 of the housing 51. This effect is particularly advantageous when the thickness T1 of the inner member 2 is small. In the examples shown in FIGS.
- the peripheral surface of the thin portion 15 in the step 16 and the outer peripheral surface 19 are connected by a surface perpendicular to the central axis O.
- the surface connecting the peripheral surface of 15 and the outer peripheral surface 19 may be inclined with respect to the direction perpendicular to the central axis O.
- the height H1 of the inner member 2 which is the distance between the end 11A and the end 11B of the inner member 2 in the direction along the central axis O, is 6.0 mm or more and 10 mm or less.
- the upper limit of the height H1 may be 9.5 mm or less, 9.0 mm or less, and further 8.5 mm or less.
- the lower limit of the height H1 may be 6.5 mm or more, 7.0 mm or more, and further 7.5 mm or more.
- the housing 51 exhibits excellent moisture permeability as compared with the conventional case.
- the central axis O of the ventilation assembly 1A is, more specifically, the central axis of the internal member 2. Further, the central axis of the protrusion 52 usually coincides with the central axis O of the ventilation assembly 1A.
- the internal member 2 and the protrusion 52 of the first embodiment are both cylindrical. Since the material forming the inner member 2 is usually an elastic body, the diameter of the inner peripheral surface 13 of the inner member 2 is usually less than or equal to the diameter of the outer peripheral surface 58 of the protrusion 52.
- the elastic modulus of the elastic member forming the inner member 2 and / or the diameter of the inner peripheral surface 13 of the inner member 2 may be, for example, the ease of inserting the inner member 2 into the protrusion 52, the housing 51-the ventilation assembly 1A. It can be set in consideration of the sealing property between them. Further, the shape of the inner member 2 that is a tubular body and the shape of the protrusion 52 that is a tubular shape are not limited to a cylinder.
- the inner diameter of the inner member 2 which is a cylinder is, for example, 6.0 to 8.0 mm.
- half the value obtained by subtracting the inner diameter from the outer diameter corresponds to the thickness T1.
- the external member 4 is a bottomed cylinder.
- a part of the peripheral wall 37 projects toward the inside of the outer member 4, more specifically, toward the central axis O. Due to the protrusion of the peripheral wall 37, the outer member 4 is provided with a plurality of grooves 41 (41A, 41B, 41C, 41D) extending along the central axis O on the outer peripheral surface 40.
- the grooves 41 are provided at equal intervals in the circumferential direction of the external member 4 when observed along the central axis O, and the opening side of the external member 4 is provided. From the end 42 to the bottom 32.
- the thickness of the peripheral wall 37 is substantially equal in the groove 41 portion and other portions of the outer member 4.
- the position where the groove 41 is provided on the outer peripheral surface 40, the interval between the adjacent grooves 41, the direction in which the groove 41 extends, and the section where the groove 41 extends between the end 42 and the bottom 32 of the external member 4 are: It is not limited to the above example. Further, the thickness of the peripheral wall 37 may be different between the groove 41 and other portions.
- the inner peripheral surface 31 of the outer member 4 in the groove 41 coincides with the peripheral surface of a virtual cylinder A centered on the central axis O.
- the inner member 2 and the outer member 4 are joined to each other by the outer peripheral surface 19 and the inner peripheral surface 31 in the groove 41 contacting each other. Since the material forming the inner member 2 is usually an elastic body, the diameter of the virtual cylinder A is usually equal to or less than the diameter of the outer peripheral surface 19.
- a gap 6A between the inner peripheral surface 31 of the outer member 4 and the outer peripheral surface 19 of the inner member 2 in the portion other than the groove 41 is a part of the space 5a. In the examples shown in FIGS.
- the outer peripheral surface 19 of the inner member 2 does not have a protruding portion protruding from the surface 19.
- the outer peripheral surface 19 constitutes a cylindrical peripheral surface over the entire circumference thereof.
- the number of gaps 6A is four.
- the number of the gaps 6A in the first embodiment may be 1 or 2 or more, and may be 2 to 8 and further 3 to 6.
- the length D8 of the portion of the inner member 2 covered by the outer member 4 along the central axis O is, for example, 3.5 mm or more and 9.5 mm or less. It may be 6.0 mm or more and 8.0 mm or less.
- the lower limit of the length D8 may be 4.0 mm or more, 4.5 mm or more, and further 5.0 mm or more.
- the upper limit of the length D8 may be 9.0 mm or less, 8.5 mm or less, and further 8.0 mm or less.
- the length D8 is in these ranges, the inner member 2 and the outer member 4 are more reliably joined to each other, and for example, when the ventilation assembly 1A is fixed to the protrusion 52 of the housing 51, the inner member 2 moves to the outer member. 4 becomes difficult to detach. In addition, it becomes possible to secure sufficient moisture permeability. Furthermore, foreign matter such as dust and water can be suppressed from entering the second space 5 from the outside of the ventilation assembly 1A.
- the length D8 is determined based on the state where the outer member 4 is inserted into the inner member 2 as far as possible.
- the length (inner-outer contact length) D4 in the direction along the central axis O where the inner member 2 and the outer member 4 abut Is a length D4 in a direction along the central axis O where the outer peripheral surface 19 of the inner member 2 and the inner peripheral surface 31 of the groove 41 of the outer member 4 are in contact with each other, for example, 4.0 to 8. It is 0 mm.
- the length D4 is in these ranges, the inner member 2 and the outer member 4 are more reliably joined to each other, and for example, when the ventilation assembly 1A is fixed to the protrusion 52 of the housing 51, the inner member 2 moves to the outer member.
- the gas permeable membrane 3 is arranged in the portion of the inner member 2 that is in contact with the inner peripheral surface 31 of the outer member 4 in the direction along the central axis O. It extends from the end portion 11A to the step 16, more specifically, to the lower end of the portion other than the thin portion 15. In addition, this portion extends over the entire outer circumferential surface 19 in the circumferential direction.
- the distance D6 in the direction along the central axis O between the end portion (lower end) 42 on the opening side of the outer member 4 and the end portion 11B of the inner member 2 is, for example, 0 to 3.0 mm, and 0.2 to It may be 2.0 mm, further 0.4 to 1.0 mm. When the distance D6 is within these ranges, the joint between the inner member 2 and the outer member 4 becomes stronger. The distance D6 is determined based on the state where the outer member 4 is inserted into the inner member 2 as far as possible.
- the external member 4 includes two or more second protrusions 34 that protrude from the inner surface 33 of the bottom portion 32 in the direction along the central axis O.
- Each of the second protrusions 34 also protrudes from the inner peripheral surface 31 of the outer member 4 toward the central axis O when observed along the central axis O.
- the second projection 34 and the end 11A of the inner member 2 are brought into contact with each other, so that the inner surface 33 of the bottom portion 32 of the outer member 4 is separated from the gas permeable membrane 3.
- the second protrusion 34 is provided so as to come into contact with the gas permeable membrane 3 in a state where the outer member 4 and the inner member 2 are joined, or so as to come into contact with both the inner member 2 and the gas permeable membrane 3. Good.
- Ventilation which is the distance between an imaginary plane perpendicular to the central axis O passing through the lowermost point in the ventilation assembly 1A and an imaginary plane perpendicular to the central axis O passing through the uppermost point.
- the height H3 of the assembly 1A is, for example, 6.0 mm or more and 12 mm or less.
- the upper limit of the height H3 may be 11 mm or less, 10.5 mm or less, and further 10 mm or less.
- the lower limit of the height H3 may be 6.5 mm or more, 7.0 mm or more, and further 7.5 mm or more.
- the height H3 is determined based on the state in which the outer member 4 is inserted into the inner member 2 as far as possible. In the example shown in FIGS. 1A, 1B and 2, the lowermost point is located at the end 11B of the inner member 2 and the uppermost point is located at the outer surface 35 of the bottom 32 of the outer member 4.
- the cross-sectional area S1 of the first space 59 cut by a plane perpendicular to the central axis of the protrusion 52 may be 5 mm 2 or more and 60 mm 2 or less.
- the lower limit of the area S1 may be 10 mm 2 or more, 12 mm 2 or more, 14 mm 2 or more, and further 16 mm 2 or more.
- the upper limit of the area S1 may be 50 mm 2 or less, 40 mm 2 or less, 30 mm 2 or less, and further 20 mm 2 or less.
- the central axis of the protrusion 52 usually coincides with the central axis O of the ventilation assembly 1A.
- the ratio S2 min / S1 of the sectional area S2 min of the second space 5 to the sectional area S1 of the first space 59 is, for example, 0. 8 or more.
- the lower limit of the ratio S2 min / S1 may be 1.0 or higher, 1.1 or higher, 1.2 or higher, 1.3 or higher, and even 1.4 or higher.
- the upper limit of the ratio S2 min / S1 is, for example, 3.0 or less, and may be 2.5 or less, further 2.0 or less.
- the ventilation assembly and the ventilation housing having the ratio S2 min / S1 in the above range have excellent breathability and / or moisture permeability.
- the area S1 is the area of the cross section of the first space 59 taken along a plane perpendicular to the central axis of the protrusion 52.
- the area S2 min is the total area of the cross section at the position where the total area obtained by summing the areas of the cross section of the second space 5 cut by the plane perpendicular to the ventilation direction as the ventilation path for each distance from the ventilation membrane is the minimum. is there.
- the “ventilation path” is a path through which gas can move between the ventilation membrane and the outside of the ventilation assembly, and the “ventilation direction” is the gas in each position when the second space is considered as the ventilation path. It means the direction of travel. Therefore, the ventilation direction differs depending on the position of the second space.
- total area totaled for each distance from the gas permeable membrane is a group of positions where the distance from the gas permeable membrane (when the gas permeable membrane has a point-symmetrical shape, the distance from the center of the gas permeable membrane) is the same. It means that the cross-sectional areas of the second space 5 are summed and considered as the total area. Then, the area S2 min represents the total area of the position where the area value is the minimum of the total area. Further, the area S2 min is determined based on the state where the outer member 4 is inserted into the inner member 2 as far as possible. In the example shown in FIGS.
- the cross section having the area S2 min is the circumferential end of the second protrusion 34 and the portion of the groove 41 where the inner member 2 and the outer member 4 are in contact with each other. It is located between the portion 46, the inner surface 33 of the bottom 32 of the outer member 4 and the end 11A of the inner member 2 (see cross section 47 in FIG. 2). However, in FIG. 2, a part of the cross section having the area S2 min (only the cross section 47 located between one second protrusion 34 and one end 46) is shown. Since the cross section having the area S2 min exists between each of the four second protrusions 34 and the eight ends 46, eight times the area of the cross section 47 corresponds to the area S2 min .
- the area S2 min can be evaluated by, for example, the method described in the examples.
- the ratio S2 out / S1 of the sectional area S2 out of the second space 5 to the sectional area S1 of the first space 59 is, for example, 0. It may be 8 or more, 1.0 or more, 1.2 or more, 1.3 or more, 1.5 or more, 1.8 or more, 2.0 or more, and even 2.2 or more.
- the upper limit of the ratio S2 out / S1 is, for example, 4.0 or less, and may be 3.0 or less.
- the ventilation assembly and the ventilation housing having the ratio S2 out / S1 in the above range have excellent breathability and / or moisture permeability.
- the area S2 out is the narrowest of the second spaces 5 that can be visually recognized when observing the second space 5 from the other end 11B side along the central axis of the ventilation assembly 1A. It is the total area of the plane that represents the cross section at the position. Further, the area S2 out is determined based on the state where the outer member 4 is inserted into the inner member 2 as far as possible. In the example shown in FIGS. 1A, 1B and 2, the cross section having the area S2 out is located between the inner peripheral surface 31 of the outer member 4 and the outer peripheral surface 19 of the inner member 2 (see the cross section 48 of FIG. 1B). ). However, in FIG.
- the cross section having the area S2 out (only the cross section 48 located between the pair of adjacent grooves 41C and 41D) is shown. Since the cross section having the area S2 out is located between the four grooves 41, four times the area of the cross section 48 corresponds to the area S2 out .
- the area S2 out can be evaluated by, for example, the method described in the examples.
- Resins with relatively high hygroscopicity such as polyamide, polycarbonate, and polybutylene terephthalate, may be used in the housing of electrical components and electronic devices.
- a case using such a resin absorbs water vapor in the surroundings, but the absorbed water vapor is released by heat from a heat source inside the case or heat from the outside such as sunlight, and a part of it is released.
- Stay inside the housing It is desirable that the accumulated water vapor inside the housing be quickly discharged to the outside of the housing via the protrusion 52 and the ventilation assembly 1A in order to prevent the inside of the housing from becoming cloudy.
- the ventilation assembly and / or the ventilation housing having excellent moisture permeability, for example, it is possible to suppress fogging inside the housing or to promote elimination of the fogging generated inside the housing.
- the height H2 of the protrusion 52 which is the distance in the direction along the central axis O from the outer surface 53 of the housing 51 to the tip 54 of the protrusion 52, is, for example, 5.0 to 12 mm, and is 4.0 mm or more and 8.0 mm or less. May be
- the ratio H1 / H2 of the height H1 of the inner member 2 to the height H2 of the protrusion 52 is 1.00 or more and 1.70 or less.
- the lower limit of the ratio H1 / H2 may be more than 1.00, 1.02 or more, 1.04 or more, 1.06 or more, 1.08 or more, and even 1.10 or more.
- the upper limit of the ratio H1 / H2 is 1.60 or less, 1.50 or less, 1.40 or less, 1.30 or less, 1.25 or less, 1.22 or less, 1.20 or less, 1.18 or less, 1. It may be 16 or less, further 1.14 or less.
- the ventilation assembly and the ventilation housing having the ratio H1 / H2 in the above range can effectively prevent the ventilation assembly from falling off the protrusion of the housing.
- the ventilation assembly 1A is used by being inserted into the protrusion 52 from the opening 12B in the other end 11B of the internal member 2, and the judgment is made on the basis of the state in which the protrusion 52 is inserted as far
- the distance D9 between the outer surface 53 of the housing 51 with the inner member 2 fixed to the protrusion 52 and the opening-side end 42 of the outer member 2 is, for example, 0.5 mm or more and 4.0 mm or less. When the distance D9 is within these ranges, the ventilation assembly 1A can be prevented from falling off the projection 52 of the housing 51, and an appropriate amount of ventilation can be secured. It should be noted that the distance D9 is determined based on the state where the outer member 4 is inserted into the inner member 2 as far as possible.
- the ventilation film 3 is a film that allows gas (typically air) to pass through in the thickness direction and prevents the penetration of foreign matter. Therefore, the ventilation assembly 1A can ensure ventilation inside and outside the housing 51 and prevent foreign matter such as dust, water, oil, and salt from entering the inside of the housing 51.
- the shape of the gas permeable membrane 3 is a circle.
- the shape of the gas permeable membrane 3 is not limited to a circle, and can be selected according to the shape of the portion of the internal member 2 where the gas permeable membrane 3 is arranged, and may be, for example, a polygonal shape.
- the gas permeable membrane 3 is arranged on the end surface of the end portion 11A of the internal member 2.
- the position where the ventilation film 3 is arranged in the ventilation assembly and the ventilation housing of the present invention is not limited to the end surface of the end portion 11A as long as the ventilation film 3 covers the opening 12A of the end portion 11A.
- the ventilation membrane 3 a woven cloth, a non-woven cloth, a mesh or a net made of resin or metal, or a resin porous membrane can be used.
- the gas permeable membrane 3 is not limited as long as it can permeate gas and prevent permeation of foreign matter such as liquid.
- the gas permeable membrane 3 in which a porous resin film and a reinforcing layer having gas permeability are laminated is used.
- the strength of the gas permeable membrane 3 can be improved by the reinforcing layer.
- the resin porous membrane is, for example, a fluororesin porous body and a polyolefin porous body which can be produced by a known stretching method or extraction method.
- the fluororesin is, for example, polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene-ethylene copolymer. It is united.
- Monomers constituting the polyolefin are, for example, ethylene, propylene and 4-methylpentene-1,1 butene, and a polyolefin which is a homopolymer or copolymer of these monomers can be used for the gas permeable membrane 3.
- a nanofiber film porous body using polyacrylonitrile, nylon, or polylactic acid may be used for the gas permeable membrane 3.
- a PTFE porous body that can ensure air permeability in a small area and has a high ability to prevent foreign matter from entering the inside of the housing 51.
- the average pore diameter of the PTFE porous body is preferably 0.01 ⁇ m or more and 10 ⁇ m or less.
- the reinforcing layer is, for example, a woven fabric, a non-woven fabric, a mesh, a net, a sponge, a foam, or a porous body made of resin or metal.
- the resin porous membrane and the reinforcing layer can be laminated by a method such as adhesive lamination, heat lamination, heat welding, ultrasonic welding, or adhesion with an adhesive.
- the breathable membrane 3 may be liquid-repellent treated.
- the liquid repellent treatment of the gas permeable film 3 can be carried out by applying a liquid repellent agent containing a substance having a small surface tension to the gas permeable film and drying the coating film formed by the coating.
- the liquid repellent contains, for example, a polymer having a perfluoroalkyl group as the above substance.
- the liquid repellent agent can be applied by, for example, an air spray method, an electrostatic spray method, a dip coating method, a spin coating method, a roll coating method, a curtain flow coating method, an impregnation method, or the like.
- the thickness of the gas permeable membrane 3 can be adjusted in the range of, for example, 1 ⁇ m or more and 5 mm or less in consideration of strength and easiness of fixing to the internal member 2.
- the air permeability of the gas permeable membrane 3 is, for example, 0. 0 as the air permeability (Gurley air permeability) measured according to the air permeability measurement method B (Gurley type method) defined in Japanese Industrial Standard (JIS) L1096. 1 to 300 seconds / 100 mL.
- the ventilation membrane 3 may be joined to the internal member 2.
- the gas permeable membrane 3 can be joined to the inner member 2 by various welding methods such as a heat welding method, an ultrasonic welding method, and a laser welding method.
- the gas permeable membrane 3 may be bonded to the inner member 2 with an adhesive or a pressure sensitive adhesive.
- the gas permeable membrane 3 may be arranged at the end 11 ⁇ / b> A of the internal member 2 by insert molding the gas permeable membrane 3 together with the internal member 2.
- the material forming the internal member 2 is usually an elastic body.
- the material forming the outer member 4 is typically a resin. These members can be formed by known molding methods such as injection molding, compression molding and powder molding. Molding of the inner member 2 and the outer member 4 by injection molding is preferable because the mass productivity of the ventilation assembly 1A can be improved.
- the elastic body that can form the inner member 2 is, for example, an elastomer (elastic resin).
- the elastomer may be rubber.
- the elastomer is, for example, nitrile rubber (NBR), ethylene-propylene rubber (EPDM), silicone rubber, fluororubber, acrylic rubber, hydrogenated rubber, and various thermoplastic elastomers.
- the resin that can form the external member 4 is, for example, a thermoplastic resin or the elastomer described above.
- the thermoplastic resin is, for example, polyamide (PA) such as nylon, polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polycarbonate (PC), polypropylene (PP), and polyphenylene ether (PPE).
- PA polyamide
- PBT polybutylene terephthalate
- PET polyethylene terephthalate
- PPS polyphenylene sulfide
- PC polycarbonate
- PP polypropylene
- PPE polyphenylene ether
- the inner member 2 and the outer member 4 may be made of the same material.
- the elastic body forming the inner member 2 and / or the resin forming the outer member 4 includes pigments such as carbon black and titanium white; reinforcing fillers such as glass particles and glass fibers; and additives such as water repellents. May be included. At least a part of the surface of the inner member 2 and / or the outer member 4 may be subjected to a liquid repellent treatment.
- the liquid-repellent treatment can be carried out by the above-mentioned method for the liquid-repellent treatment of the gas permeable membrane 3, an electrodeposition coating method, a film formation by plasma polymerization or the like.
- the inner member 2 and / or the outer member 4 may include a locking mechanism that detachably joins the inner member 2 and the outer member 4.
- the locking mechanism includes, for example, a claw portion, a screw portion, a fitting portion, and the like.
- the housing 51 is made of, for example, resin, metal, or a composite material thereof.
- the protrusion 52 is also the same.
- the resin forming the protrusions 52 is usually not an elastic body.
- the resin forming the protrusion 52 is, for example, a thermoplastic resin (excluding an elastic body) or a thermosetting resin.
- the thermoplastic resin is, for example, the various thermoplastic resins exemplified above as the resin that can form the external member 4, acrylonitrile-butadiene-styrene copolymer resin (ABS), or the like.
- the configuration of the housing 51 is not limited as long as it includes the protrusion 52.
- FIGS. 3A and 3B The ventilation assembly 1B of the second embodiment is shown in FIGS. 3A and 3B.
- FIG. 3B shows a cross section BB of the ventilation assembly 1B shown in FIG. 3A.
- FIG. 3A shows a cross section AOA of the vent assembly 1B shown in FIG. 3B.
- the ventilation assembly 1B is fixed to the projection 52 of the housing 51, in other words, the vicinity of the projection 52 in the ventilation housing in which the ventilation assembly 1B is fixed to the projection 52 of the housing 51, It is shown.
- An exploded perspective view of the ventilation assembly 1B shown in FIGS. 3A and 3B is shown in FIG.
- the ventilation assembly 1B has a cylindrical shape having a first space 59 which extends from the outer surface 53 of the housing 51 and extends and which communicates the inside and outside of the housing 51 inside. It is fixed to the protrusion 52.
- the ventilation assembly 1B of the second embodiment is the same as the ventilation assembly 1A of the first embodiment except that the shape of the external member 4 is different. Description that overlaps with the first embodiment will be omitted.
- the outer member 4 of the ventilation assembly 1B is a bottomed cylinder, and when observed along the central axis O, two or more third protrusions that protrude from the inner peripheral surface 31 toward the inside of the outer member 4 are provided.
- Each of the third protrusions 43 extends from the opening-side end 42 of the external member 4 to the bottom 32.
- the extending direction of each third protrusion 43 is the direction along the central axis O. Further, each third protrusion 43 is connected to the second protrusion 34 at the bottom 32.
- the direction in which the third protrusion 43 extends and the section in which the third protrusion 43 extends between the end 42 and the bottom 32 are not limited to the above example. Further, the third protrusion 43 and the second protrusion 34 may not be connected, and the external member 4 has the second protrusion 34 and the third protrusion 43 which are independent of each other. May be.
- the inner member 2 and the outer member 4 in the second embodiment are joined to each other by the outer peripheral surface 19 of the inner member 2 and the tip end surface 44 of the third protrusion 43 of the outer member 4 contacting each other. Further, in the examples shown in FIGS. 3A, 3B, and 4, the tip end surface 44 of the third protrusion 43 coincides with the peripheral surface of an imaginary cylinder C centered on the central axis O. Since the material forming the inner member 2 is usually an elastic body, the diameter of the virtual cylinder C is usually equal to or smaller than the diameter of the outer peripheral surface 19.
- each third protrusion 43 is the peripheral surface of the virtual cylinder C. Does not have to match.
- the gap 6B between the inner peripheral surface 31 of the outer member 4 and the outer peripheral surface 19 of the inner member 2 is a part of the space 5a. 3A, 3B and 4, each gap 6B is surrounded by the inner peripheral surface 31, the outer peripheral surface 19 and the third protruding portion 43.
- the external member 4 shown in FIGS. 3A, 3B, and 4 includes twelve third protrusions 43.
- the number of the third protrusions 43 in the second embodiment is, for example, 6 to 16.
- the cross section having the area S2 min includes the tips 49 of the adjacent second protrusions 34 on the side of the central axis O and the inner surface 33 of the bottom 32 of the outer member 4. And the end 11A of the inner member 2 (see cross section 47 in FIG. 4).
- a part of the cross section having the area S2 min is shown. Since the cross section having the area S2 min exists between the twelve second protrusions 34, 12 times the area of the cross section 47 corresponds to the area S2 min .
- the cross section having the area S2 out is located between the inner peripheral surface 31 of the outer member 4, the outer peripheral surface 19 of the inner member 2 and the third protrusion 43. (See section 48 in FIG. 3B). However, in FIG. 3B, a part of the cross section having the area S2 out (only the cross section 48 located between the pair of adjacent third protrusions 43) is shown. Since the cross section having the area S2 out is located between the twelve second protrusions 34, 12 times the area of the cross section 48 corresponds to the area S2 out .
- FIG. 5A and FIG. 5B show a cross section BB of the ventilation assembly 1C shown in FIG. 5A.
- FIG. 5A shows a cross section AOA of the ventilation assembly 1C shown in FIG. 5B.
- the ventilation assembly 1C is fixed to the protrusion 52 of the housing 51, in other words, the vicinity of the protrusion 52 in the ventilation housing in which the ventilation assembly 1C is fixed to the protrusion 52 of the housing 51, It is shown.
- An exploded perspective view of the ventilation assembly 1C shown in FIGS. 5A and 5B is shown in FIG.
- the ventilation assembly 1C has a cylindrical shape having a first space 59 inside which extends so as to project from the outer surface 53 of the housing 51 and communicates the inside and outside of the housing 51. It is fixed to the protrusion 52.
- the ventilation assembly 1C of the third embodiment is the same as the ventilation assembly 1B of the second embodiment except that the shape of the internal member 2 is different. Descriptions that overlap with those of the second embodiment will be omitted.
- the thickness T1 of the inner member 2 in the ventilation assembly 1 is more specific as it goes from the upper end (end 11A) to the lower end (end 11B) of the inner member 2 in a state where the outer member 4 is not joined.
- the inner member 2 has a slope that extends downward as an outer peripheral surface 19 (see FIG. 6). ).
- the thickness T1 continuously increases from the upper end of the inner member 2 toward the lower end thereof, more specifically, from the end 11A to the step 16.
- the state of the increase is not limited to the above example, and for example, it may be increased intermittently or there may be a decreased portion. In the example shown in FIG.
- the outer peripheral surface 19 of the inner member 2 constitutes a peripheral surface of a truncated cone whose diameter increases from the upper end toward the lower end. Further, in a state where the outer member 4 is joined (see FIGS. 5A and 5B), each third protrusion 43 of the outer member 4 abuts on the outer peripheral surface 19 of the inner member 2 made of an elastic body. While compressing the part, it bites into the outer peripheral surface 19, and the tip end surface 44 thereof enters the inside of the inner member 2 compared to the position of the outer peripheral surface 19 in the state where the outer member 4 is not joined.
- each of the third protrusions 43 bites into the outer peripheral surface 19 at the portion in contact with the outer peripheral surface 19 of the inner member 2 increases from the bottom portion 32 of the outer member 4 toward the end portion 42. From the upper end (end 11A) to the lower end (end 11B). According to the combination of the inner member 2 and the outer member 4 having the above-described shapes, it is possible to increase the downward compression rate between both members in the portion where the inner member 2 and the outer member 4 are in contact with each other. The outer member 4 can be joined to the inner member 2 more reliably.
- the direction of the force acting on the inner member 2 by the joining of the outer member 4 is the direction perpendicular to the surface of the slope, that is, the outer surface of the housing 51. Since the inner member 2 is pressed toward the 53 side, the ventilation assembly 1C can be more reliably prevented from falling off the projection 52.
- the thickness T1 (T1a) of the inner member 2 at the end 11A may be in the range of T1 described above, and in this case, sufficient strength as the inner member 2 is secured, For example, tearing of the inner member 2 when joining the outer member 4 to the inner member 2 can be suppressed.
- FIGS. 7A and 7B The ventilation assembly 1D of the fourth embodiment is shown in FIGS. 7A and 7B.
- FIG. 7B shows a cross section BB of the ventilation assembly 1D shown in FIG. 7A.
- 7A and 7B show a state in which the ventilation assembly 1D is fixed to the protrusion 52 of the housing 51, in other words, the vicinity of the protrusion 52 in the ventilation housing in which the ventilation assembly 1D is fixed to the protrusion 52 of the housing 51, It is shown.
- An exploded perspective view of the ventilation assembly 1D shown in FIGS. 7A and 7B is shown in FIG.
- the ventilation assembly 1D has a tubular shape that has a first space 59 inside that extends so as to project from the outer surface 53 of the housing 51 and that communicates the inside and outside of the housing 51. It is fixed to the protrusion 52.
- the ventilation assembly 1D of the fourth embodiment is the same as the ventilation assembly 1A of the first embodiment, except that the shapes of the inner member 2 and the outer member 4 are different. Description that overlaps with the first embodiment will be omitted.
- the inner member 2 of the ventilation assembly 1D has ribs 18 extending in the circumferential direction on the outer peripheral surface 19.
- the inner member 2 and the outer member 4 are joined by abutting the outer peripheral surface 19 of the inner member 2 and the inner peripheral surface 31 of the outer member 4. Since the material forming the inner member 2 is usually an elastic body, the diameter of the inner peripheral surface 31 of the outer member 4 is usually less than or equal to the diameter of the outer peripheral surface 19 of the inner member 2. Further, in a state where the inner member 2 and the outer member 4 are joined, the rib 18 is in contact with the opening-side end of the outer member 4.
- a gap 6C is provided inside the peripheral wall 37 of the external member 4.
- the gap 6C is a part of the space 5a.
- a part of the peripheral wall 37 of the external member 4 closer to the central axis O than the gap 6C is divided into a plurality of beam portions 39 by a plurality of slits 38 extending in the direction along the central axis O.
- Each second protrusion 34 of the outer member 4 is connected to the upper end of each beam 39. With such a shape, the weight of the external member 4 and the ventilation assembly 1D can be reduced.
- the cross section having the area S2 min has the tips 49 of the adjacent second protrusions 34 on the side of the central axis O and the inner surface 33 of the bottom 32 of the outer member 4. And the end portion 11A of the inner member 2 (see the cross section 47 of FIG. 8).
- a part of the cross section having the area S2 min is shown. Since the cross section having the area S2 min exists between the eight second protrusions 34, eight times the area of the cross section 47 corresponds to the area S2 min .
- the cross section having the area S2 out corresponds to the cross section of the gap 6C cut by the plane perpendicular to the central axis O (see the cross section 48 of FIG. 7B).
- FIGS. 9A and 9B The ventilation assembly 1E of the fifth embodiment is shown in FIGS. 9A and 9B.
- 9B shows a cross section BB of the ventilation assembly 1E shown in FIG. 9A. 9A and 9B, the ventilation assembly 1E is fixed to the projection 52 of the housing 51, in other words, the vicinity of the projection 52 in the ventilation housing in which the ventilation assembly 1E is fixed to the projection 52 of the housing 51, It is shown.
- An exploded perspective view of the ventilation assembly 1E shown in FIGS. 9A and 9B is shown in FIG.
- the ventilation assembly 1E has a tubular shape having a first space 59 inside which extends so as to project from the outer surface 53 of the housing 51 and communicates the inside and outside of the housing 51. It is fixed to the protrusion 52.
- the ventilation assembly 1E of the fifth embodiment is the same as the ventilation assembly 1A of the first embodiment except that the shapes of the inner member 2 and the outer member 4 are different. Description that overlaps with the first embodiment will be omitted.
- the inner member 2 of the ventilation assembly 1E has two or more protruding portions 21 protruding from the outer peripheral surface 19 toward the outside of the inner member 2 when observed along the central axis O.
- the protrusions 21 are provided at equal intervals in the circumferential direction of the outer peripheral surface 19.
- Each of the protrusions 21 extends in the direction along the central axis O from one end 11A of the internal member 2 to the step 16.
- the section in which the protruding portion 21 extends in the direction along the central axis O between the one end 11A of the inner member 2 and the other end 11B is not limited to the above example.
- each protruding portion 21 has a portion 23 having a small protruding amount from the outer peripheral surface 19 on the other end 11B side.
- the inner member 2 and the outer member 4 in the fifth embodiment are joined to each other by the peripheral surface 22 of the protruding portion 21 of the inner member 2 and the inner peripheral surface 31 of the outer member 4 contacting each other. Further, in the examples shown in FIGS. 9A, 9B and 10, the peripheral surface 22 coincides with the peripheral surface of a virtual cylinder D centered on the central axis O. Since the material forming the inner member 2 is usually an elastic body, the diameter of the virtual cylinder D is usually equal to or larger than the diameter of the inner peripheral surface 31.
- each protruding portion 21 is the same as the circumferential surface of the virtual cylinder D. You don't have to.
- the gap 6D between the inner peripheral surface 31 of the outer member 4 and the outer peripheral surface 19 of the inner member 2 is a part of the space 5a. In the examples shown in FIGS. 9A, 9B and 10, each gap 6D is surrounded by the inner peripheral surface 31, the outer peripheral surface 19 and the protruding portion 21.
- the inner member 2 shown in FIGS. 9A, 9B and 10 has six protrusions 21.
- the number of protrusions 21 in the fifth embodiment is, for example, 3-8.
- the cross section having the area S2 min is located between the inner peripheral surface 31 of the outer member 4, the outer peripheral surface 19 of the inner member 2, and the protrusion 21 (FIG. 10). Section 47). However, in FIG. 10, a part of the cross section having the area S2 min (only the cross section 47 located between the pair of adjacent protruding portions 21) is shown. Since the cross section having the area S2 min exists between the six protrusions 21, six times the area of the cross section 47 corresponds to the area S2 min .
- the cross section having the area S2 out projects from the inner peripheral surface 31 of the outer member 4 and the outer peripheral surface 19 of the inner member 2 at the end 42 on the opening side of the outer member 4. Located between the parts 21 (see cross section 48 in FIG. 10). However, in FIG. 10, a part of the cross section having the area S2 out (only the cross section 48 located between the pair of adjacent protrusions 21) is shown. Since the cross section having the area S2 out is located between each of the six protruding portions 21, six times the area of the cross section 48 corresponds to the area S2 out .
- the outer member 4 has the protruding claw 45 on the opening side toward the inner side of the outer member 4, more specifically toward the central axis O. It has at the end on the side of the end portion 42 of the.
- the claw 45 is engaged with the portion 23 of the inner member 2 and functions as a retaining mechanism that detachably joins the outer member 4 and the inner member 2.
- the locking mechanism more specifically, by locking the claw 45 to the portion 23, it is possible to more reliably join the inner member 2 and the outer member 4, for example, the ventilation assembly 1E to the housing. It is possible to prevent the outer member 4 from falling off from the inner member 2 when fixing to the protrusion 52 of the 51.
- Example 1 An internal member 2 having the shape shown in FIG. 11A was produced by injection molding using an olefin-based thermoplastic elastomer (Mitsui Chemicals, Inc. Mirastomer (registered trademark), hardness 71, density 880 kg / m 3 ).
- the maximum thickness of the obtained internal member 2 is 2.4 mm, the minimum thickness is 1.1 mm, the outer diameter of the portion having the maximum thickness is 12 mm, the outer diameter of the portion having the minimum thickness is 10 mm, the inner diameter is 7.5 mm, and the height is high.
- the height H1 was 8.0 mm.
- the inner member 2 of FIG. 11A has the same shape as the inner member 2 of FIGS. 3A, 3B and 4 except that the end portion 11A has a protrusion (bridge) 62 protruding into the inner space of the inner member 2.
- An external member 4 having a shape shown in FIGS. 11A and 11B was produced by injection molding using polypropylene (manufactured by Japan Polypro Co., Ltd.) as a material.
- the maximum thickness of the obtained external member 4 is 2.5 mm, the minimum thickness is 0.6 mm, the outer diameter is 16 mm, the inner diameter of the portion having the maximum thickness is 11.1 mm, and the inner diameter of the portion having the minimum thickness is 13.3 mm.
- the height was 9.0 mm.
- the external member 4 of FIGS. 11A and 11B has a claw 45 protruding in the direction of the central axis O at the end of the third protrusion 43 on the side of the end 42, except that the external member 4 of FIGS. It had the same shape as the member 4. 11A and 11B, the inner member 2 and the outer member 4 are viewed from below (the opening side of the outer member 4).
- a laminate of a PTFE stretched porous membrane and a non-woven fabric of PE / PET composite fibers manufactured by Nitto Denko KK, TEMISH "NTF1026-L01", air flow rate: 50 cm 3 / min
- the air-permeable membrane 3 was produced by punching into a 12 mm circle.
- the gas permeable membrane 3 was arranged so as to completely cover the through holes 14 of the inner member 2, and the gas permeable membrane 3 was welded to the inner member 2 by pressure bonding and heating at a temperature of 200 ° C. and a pressure of 20 N for 2 seconds.
- the inner member 2 having the air-permeable membrane 3 welded thereto was press-fitted (inserted) into the outer member 4 to obtain a ventilation assembly.
- FIGS. 12A and 12B A case lid 61 was prepared.
- FIG. 12B shows a cross section BB of FIG. 12A.
- the protrusion 52 had an outer diameter of 8.5 mm, an inner diameter of 5.0 mm, and a height H2 of 6.0 mm.
- the projection 52 of the housing lid 61 is inserted into the opening (opening at the lower end) of the internal member 2 of the ventilation assembly (inserted until the lower end of the internal member 2 contacts the housing 61).
- a housing lid with a ventilation assembly in which the ventilation assembly was fixed to the protrusion 52 was prepared.
- Table 1 shows the results of moisture permeability.
- the "insertion depth of the external member” in Table 1 means the length in the direction along the central axis of the portion of the internal member covered by the external member when observed in the direction perpendicular to the central axis of the ventilation assembly. To do.
- the “inside / outside contact length” means the length along the central axis of the portion where the external member and the internal member are in contact with each other when observed in the direction perpendicular to the central axis of the ventilation assembly.
- the “ventilation distance” means a distance obtained by adding a height having a larger value selected from the height H1 of the inner member and the height H2 of the protrusion and the insertion depth of the outer member.
- “Ventilation distance” substantially corresponds to the distance from the interior of the housing to the outlet of the ventilation assembly.
- Examples 2 to 4, Comparative Examples 1 to 6 The height H1 of the inner member 2, the height H2 of the protrusion 52, the air flow rate of the gas permeable membrane 3, the height of the outer member 4, the insertion depth of the outer member 4, and the inner / outer contact length are set to the values described in Table 1.
- a moisture permeability test was conducted in the same manner as in Example 1 except that the moisture content was changed. Table 1 shows the results of moisture permeability.
- Comparative Examples 7 to 9 A moisture permeability test was performed in the same manner as in Example 1 except that the shapes of the inner member 2 and the outer member 4 were changed to the shapes shown in FIGS. 13A and 13B. Table 1 shows the results of moisture permeability.
- the height H1 of the inner member 2, the height H2 of the protrusion 52, the ventilation amount of the gas permeable membrane 3, the height of the outer member 4, the insertion depth of the outer member 4, and the inner / outer contact length of Comparative Examples 7 to 9 are as follows. It is as described in Table 1.
- the inner member 2 in FIG. 13A had the same shape as the inner member 2 in FIGS. 9A, 9B, and 10 except that the number of protrusions 21 was four.
- 13A and 13B does not have the claw 45, and the position of the end portion 42 on the opening side is lower than the step 16 when viewed in the direction perpendicular to the central axis of the ventilation assembly, Also, except that the inner surface 33 of the bottom portion 32 has three second protrusions 34 extending from the inner peripheral surface 31 toward the direction of the central axis, the same as the outer member 4 of FIGS. 9A, 9B, and 10. Had the shape of. 13A and 13B, the inner member 2 and the outer member 4 are viewed from below.
- FIG. 14 shows a graph in which the relationship between the water vapor transmission rate and the ventilation distance is plotted for Examples 1 to 4 and Comparative Examples 1 to 9.
- black circles ( ⁇ ) are plots of Examples 1 and 2 and Comparative Examples 1 to 5 in which the height H1 of the internal member is 8.0 mm and the gas permeability of the gas permeable membrane is 50 cm 3 / min.
- Black triangles ( ⁇ ) are plots of Examples 3 and 4 and Comparative Example 6 in which the height H1 of the internal member is 8.0 mm and the gas permeability of the gas permeable membrane is 13000 cm 3 / min.
- the circles ( ⁇ ) are plots of Comparative Examples 7 to 9 in which the height H1 of the internal member is 12 mm and the gas permeability of the gas permeable membrane is 50 cm 3 / min.
- FIG. 14 although there is a difference of about 260 times in the ventilation amount of the gas permeable membrane between Examples 1 and 2 and Comparative Examples 1 to 5 and Examples 3 to 4 and Comparative Example 6, It is clear that there is no great difference in the water vapor transmission rate as compared with the air transmission distance, and the air transmission distance has a great influence on the water vapor transmission rate.
- the ventilation housings (Comparative Examples 7 to 9) in which the height H1 of the internal member is 12 mm, the ventilation distance tends to be relatively long, and therefore the moisture permeability tends to be low as a whole.
- the air permeable casings (Examples 1 to 4 and Comparative Examples 1 to 6) in which the height H1 of the internal member is 8.0 mm tend to increase the moisture permeability as a whole.
- the ratio H1 / H2 of the height H1 of the internal member to the height H2 of the protrusion It was confirmed that when the ratio is less than 1.00, the air permeability becomes long as a result, and the water vapor transmission rate becomes low.
- a ventilation assembly B was obtained in the same manner as in Example 1 except that the shapes of the inner member 2 and the outer member 4 were changed to those shown in FIGS. 13A and 13B.
- a ventilation assembly C was obtained in the same manner as in Example 1 except that the shapes of the inner member 2 and the outer member 4 were changed to the shapes shown in FIGS. 15A and 15B.
- the inner member 2 of FIG. 15A had the same shape as the inner member 2 of FIGS. 7A, 7B, and 8 except that it did not have the rib 18.
- the external member 4 of FIGS. 15A and 15B had the same shape as the external member 4 of FIGS. 7A, 7B, and 8 except that the position and shape of the second protrusion 34 were different.
- a gap 6C which is a part of the space 5a, was provided inside the peripheral wall of the external member 4. 15A and 15B, the inner member 2 and the outer member 4 are viewed from below.
- a ventilation assembly D was obtained by the same method as in Example 1 except that the shapes of the inner member 2 and the outer member 4 were changed to the shapes shown in FIGS. 16A and 16B.
- the inner member 2 of FIG. 16A had the same shape as the inner member 2 of FIGS. 7A, 7B and 8.
- the outer member 4 of FIGS. 16A and 16B had the same shape as the outer member 4 of FIGS. 7A, 7B, and 8. 16A and 16B, the inner member 2 and the outer member 4 are viewed from below.
- a ventilation assembly E was obtained in the same manner as in Example 1 except that the shapes of the inner member 2 and the outer member 4 were changed to the shapes shown in FIGS. 17A and 17B.
- the inner member 2 of FIG. 17A had the same shape as the inner member 2 of FIGS. 9A, 9B and 10 except that the number of the protruding portions 21 was three.
- 17A and 17B does not have the claw 45, and the position of the end 42 on the opening side is lower than the step 16 when viewed in the direction perpendicular to the central axis of the ventilation assembly, Also, except that the inner surface 33 of the bottom portion 32 has three second protrusions 34 extending from the inner peripheral surface 31 in the direction of the central axis, the same as the outer member 4 of FIGS. 9A, 9B, and 10. Had the shape of. 17A and 17B, the inner member 2 and the outer member 4 are viewed from below.
- the height H1 of the internal member, the height of the external member, and the insertion depth of the external member in the ventilation assemblies B to E are the same as those of the ventilation assembly A.
- the area S2 min of the cross section having the smallest area was measured among the cross sections of the second space cut by the plane perpendicular to the ventilation direction as the ventilation path.
- the cross section 47 of each drawing can be referred to.
- a part of the cross section that is the minimum unit of the cross section having the smallest area is shown as the cross section 47.
- the area S2 min of the cross section having the smallest area is 12 times (the ventilation assembly A), 3 times (the ventilation assembly B), 6 times (the ventilation assembly C) and 8 times (the ventilation area) the area of the cross section 47. Assembly D).
- the specific operation of the measurement was as follows.
- the area S2 min of the ventilation assembly E is an area S2 out which will be described later, but the total area at the minimum position excluding the position of the area S2 out is the area of the cross section 47 tripled. .
- the external member 4 was photographed so as to include the cross section having the smallest area.
- the obtained image was taken into the image analysis software ImageJ which is software capable of measuring the dimension of the image, and the scale of the image data was set so as to match the dimension (measured value) of the ventilation assembly.
- ImageJ image analysis software
- the dimension of the cross section having the smallest area was measured by the image analysis software, and the area S2 min was calculated.
- the results of S2 min are shown in Table 2. Note that, as an example, an image used for measuring S2 min for the ventilation assemblies A and B is shown in FIG. 18A shows the ventilation assembly A, and FIG. 18B shows the ventilation assembly B.
- the white line 71 in the image corresponds to the cross section having the smallest area.
- FIG. 19A shows the ventilation assembly A
- FIG. 19B shows the ventilation assembly B
- 20 shows an image after the binarization process in each ventilation assembly.
- the area of the black portion in the image was calculated by the image analysis software to calculate the area S2 out .
- the results of S2 out are shown in Table 2.
- the protrusion 52 had an outer diameter of 8.5 mm, an inner diameter of 5.0 mm, and a height of 6.0 mm.
- the cross-sectional area S1 of the first space cut by the plane perpendicular to the central axis of the protrusion 52 was 19.6 mm 2 .
- FIG. 21 is a graph plotting the relationship between the ratio S2 out / S1 and the water vapor transmission rate for Examples 5 to 9. It was confirmed that in Examples 5, 6, 8 and 9 in which the ratio S2 min / S1 was 1.0 or more, the moisture permeability was improved as the ratio S2 out / S1 was increased.
- Example 10 An internal member 2 having a shape shown in FIG. 13A was produced by injection molding using an olefin-based thermoplastic elastomer (MILASTOMMER (registered trademark) manufactured by Mitsui Chemicals, Inc., hardness 71, density 880 kg / m 3 ).
- MILASTOMMER olefin-based thermoplastic elastomer manufactured by Mitsui Chemicals, Inc.
- the thickness of the portion having the protruding portion 21 was 4.2 mm
- the thickness of the portion not having the protruding portion 21 (non-protruding portion) was 2.3 mm
- the outer diameter of the portion having the protruding portion 21 was 16 mm
- the outer diameter of the non-protruding portion was 12 mm
- the inner diameter was 7.5 mm
- the height H1 was 6.0 mm.
- a polypropylene (PP) projection 52 was prepared as a cylindrical projection 52 that can be provided in the housing (see FIG. 22).
- the protrusion 52 had an outer diameter of 8.5 mm, an inner diameter of 5.0 mm, and a height H2 of 6.0 mm.
- a clip is fixed to one grip of a tensile tester (manufactured by Shimadzu Corporation, Autograph AGS-X), and the other grip has a protrusion on the internal member 2 in the displacement direction of the tensile tester.
- the protrusions were fixed so that the insertion direction of was vertical.
- a tensile test was carried out at a tensile speed of 200 mm / min, whereby a pull-out test of the internal member 2 from the projection 52 was carried out (see FIG. 22).
- the SS curve obtained by the tensile test is shown in FIG.
- the maximum value of the load on the SS curve was taken as the pulling force (horizontal pulling force) of the internal member 2.
- Table 3 shows the results of the pulling force.
- Example 11 to 24, Comparative Examples 10 to 23 A tensile test (internal member pull-out test) was performed in the same manner as in Example 10 except that the height H1 of the inner member 2 and the height H2 of the protrusion 52 were changed to the values shown in Table 3. Table 3 shows the results of the pulling force.
- FIG. 24 shows a graph in which the relationship between the ratio H1 / H2 and the pulling force is plotted for the examples and comparative examples in which the internal member 2 is pulled out without being damaged.
- the numerical value in the legend of the graph is the height H1 of the internal member 2.
- the ratio H1 / H2 of the height H1 of the inner member to the height H2 of the protrusion exceeds 1.70, it was clear that the pulling-out force tended to significantly decrease.
- the ventilation housing in which the height H1 of the internal member is 6 mm or more and 10 mm or less and the ratio H1 / H2 of the height H1 of the internal member to the height H2 of the protrusion is 1.00 or more and 1.70 or less is It was confirmed that this is an excellent ventilation housing that has both moisture permeability and withdrawal resistance.
- An internal member 2 having a shape shown in FIG. 13A was produced by injection molding using an olefin-based thermoplastic elastomer (MILASTOMMER (registered trademark) manufactured by Mitsui Chemicals, Inc., hardness 71, density 880 kg / m 3 ).
- MILASTOMMER olefin-based thermoplastic elastomer manufactured by Mitsui Chemicals, Inc.
- the thickness of the portion having the protruding portion 21 was 4.2 mm
- the thickness of the portion not having the protruding portion 21 (non-protruding portion) was 2.3 mm
- the outer diameter of the portion having the protruding portion 21 was 16 mm
- the outer diameter of the non-protruding portion was 12 mm
- the inner diameter was 7.5 mm
- the height H1 was 6.0 mm.
- An external member 4 having a shape shown in FIGS. 13A and 13B was produced by injection molding using polypropylene (manufactured by Japan Polypro Co., Ltd.) as a material.
- the outer member 4 thus obtained had a thickness of 1.0 mm, an outer diameter of 17.5 mm, an inner diameter of 15.6 mm, and a height of 12 mm.
- a polypropylene (PP) projection 52 was prepared as a cylindrical projection 52 that can be provided in the housing (see FIG. 22).
- the outer diameter of the protrusion was 8.1 mm, the inner diameter was 5.0 mm, and the height H2 was 10 mm.
- a hole was made in the bottom portion 32 of the outer member 4 (the side opposite to the side to be inserted into the inner member 2), and a screw was passed through.
- the inner member 2 was press-fitted (inserted) into the outer member 4 (insertion depth of the outer member 4 was 10 mm) to obtain a ventilation assembly.
- the protrusion was inserted into the inner member 2, and the ventilation assembly was covered over the protrusion (height 10 mm).
- FIG. 25 shows an example of the SS curve obtained by the tensile test.
- the maximum value of the load on the SS curve was taken as the pulling force of the external member 4.
- the results of the pulling force are shown in Table 4. Note that, in FIG. 25, the reference example Nos. 2, No. 3, No. 4, no. 5, No. 6 SS curves are shown.
- FIG. 26 shows a graph plotting the relationship between the insertion depth of the external member and the pulling force for the reference example.
- the numerical value in the legend of FIG. 26 is the outer diameter of the protrusion.
- FIG. 27 shows a graph in which the relationship between the insertion depth of the external member and the water vapor transmission rate is plotted for Comparative Examples 1 to 3 of ⁇ Ventilation case 1 of the ventilation housing> described above.
- the numerical value in the legend of FIG. 27 is the outer diameter of the protrusion.
- the ventilation housing of the present invention can be used for the same purpose as a conventional ventilation housing.
Abstract
Description
筐体と通気アセンブリとを備える通気筐体であって、
前記筐体は、前記筐体の外表面から突出して延びるとともに前記筐体の内外を連通する第1の空間を内側に有する筒状の突起を備え、
前記通気アセンブリは、
双方の端部に開口を有する筒状体である内部部材と、
前記内部部材の一方の前記端部における前記開口を覆う通気膜と、
有底の筒状体であり、内側に前記内部部材が前記一方の端部の側から挿入されて、挿入された状態で前記内部部材と接合する外部部材と、を備え、
前記通気アセンブリは、前記内部部材の他方の前記端部における前記開口に前記突起が挿入されて、前記内部部材の内周面と前記突起の外周面とが当接した状態で前記突起に固定されており、
前記通気アセンブリは、前記内部部材の内部、前記外部部材の内部、及び接合した前記内部部材と前記外部部材との間から選ばれる少なくとも1つに、前記通気膜と前記通気アセンブリの外部とを接続する通気路となる第2の空間を有し、
前記内部部材の高さH1が、6.0mm以上10mm以下であり、
前記突起の高さH2に対する前記内部部材の高さH1の比H1/H2が、1.00以上1.70以下であることを特徴とする、通気筐体、
を提供する。
筐体と通気アセンブリとを備える通気筐体であって、
前記筐体は、前記筐体の外表面から突出して延びるとともに前記筐体の内外を連通する第1の空間を内側に有する筒状の突起を備え、
前記通気アセンブリは、
双方の端部に開口を有する筒状体である内部部材と、
前記内部部材の一方の前記端部における前記開口を覆う通気膜と、
有底の筒状体であり、内側に前記内部部材が前記一方の端部の側から挿入されて、挿入された状態で前記内部部材と接合する外部部材と、を備え、
前記通気アセンブリは、前記内部部材の他方の前記端部における前記開口に前記突起が挿入されて、前記内部部材の内周面と前記突起の外周面とが当接した状態で前記突起に固定されており、
前記通気アセンブリは、前記内部部材の内部、前記外部部材の内部、及び接合した前記内部部材と前記外部部材との間から選ばれる少なくとも1つに、前記通気膜と前記通気アセンブリの外部とを接続する通気路となる第2の空間を有し、
前記内部部材の高さH1が、6.0mm以上10mm以下であり、
前記突起の高さH2に対する前記内部部材の高さH1の比H1/H2が、1.00以上1.70以下であることを特徴とする。
前記突起の中心軸に垂直な平面により切断した前記第1の空間の断面の面積S1と、前記通気路としての通気方向に垂直な平面により切断した前記第2の空間の断面の面積を前記通気膜からの距離毎に合計した総面積が最小となる位置の総面積S2minとの比率S2min/S1が1.0以上である。
前記突起の中心軸に垂直な平面により切断した前記第1の空間の断面の面積S1と、前記通気アセンブリの中心軸に沿って前記他方の端部側から前記第2の空間を観察したときに、前記第2の空間が最も狭くなる位置の断面を表す平面の総面積S2outとの比率S2out/S1が1.0以上である。
前記通気アセンブリの中心軸に垂直な方向に観察したときに、
前記内部部材における前記外部部材により覆われる部分の前記中心軸に沿う方向の長さが6.0mm以上8.0mm以下である。
前記外部部材及び/又は前記内部部材が、前記外部部材と前記内部部材とを脱着可能に接合する係止機構を有する。
第1実施形態の通気アセンブリ1Aを図1A及び図1Bに示す。図1Bには、図1Aに示す通気アセンブリ1Aの断面B-Bが示されている。図1Aには、図1Bに示す通気アセンブリ1Aの断面A-O-Aが示されている。図1Bの「O」は、通気アセンブリ1Aの中心軸である。図1A及び図1Bには、筐体51の突起52に通気アセンブリ1Aが固定された状態、言い換えると、筐体51の突起52に通気アセンブリ1Aが固定された通気筐体における突起52の近傍、が示されている。図1A及び図1Bに示す通気アセンブリ1Aの分解斜視図を図2に示す。図1A、図1B及び図2に示すように、通気アセンブリ1Aは、筐体51の外表面53から突出して延びるとともに筐体51の内外を連通する第1の空間59を内側に有する筒状の突起52に対して固定される。
第2実施形態の通気アセンブリ1Bを図3A及び図3Bに示す。図3Bには、図3Aに示す通気アセンブリ1Bの断面B-Bが示されている。図3Aには、図3Bに示す通気アセンブリ1Bの断面A-O-Aが示されている。図3A及び図3Bには、筐体51の突起52に通気アセンブリ1Bが固定された状態、言い換えると、筐体51の突起52に通気アセンブリ1Bが固定された通気筐体における突起52の近傍、が示されている。図3A及び図3Bに示す通気アセンブリ1Bの分解斜視図を図4に示す。図3A、図3B及び図4に示すように、通気アセンブリ1Bは、筐体51の外表面53から突出して延びるとともに筐体51の内外を連通する第1の空間59を内側に有する筒状の突起52に対して固定される。
第3実施形態の通気アセンブリ1Cを図5A及び図5Bに示す。図5Bには、図5Aに示す通気アセンブリ1Cの断面B-Bが示されている。図5Aには、図5Bに示す通気アセンブリ1Cの断面A-O-Aが示されている。図5A及び図5Bには、筐体51の突起52に通気アセンブリ1Cが固定された状態、言い換えると、筐体51の突起52に通気アセンブリ1Cが固定された通気筐体における突起52の近傍、が示されている。図5A及び図5Bに示す通気アセンブリ1Cの分解斜視図を図6に示す。図5A、図5B及び図6に示すように、通気アセンブリ1Cは、筐体51の外表面53から突出して延びるとともに筐体51の内外を連通する第1の空間59を内側に有する筒状の突起52に対して固定される。
第4実施形態の通気アセンブリ1Dを図7A及び図7Bに示す。図7Bには、図7Aに示す通気アセンブリ1Dの断面B-Bが示されている。図7A及び図7Bには、筐体51の突起52に通気アセンブリ1Dが固定された状態、言い換えると、筐体51の突起52に通気アセンブリ1Dが固定された通気筐体における突起52の近傍、が示されている。図7A及び図7Bに示す通気アセンブリ1Dの分解斜視図を図8に示す。図7A、図7B及び図8に示すように、通気アセンブリ1Dは、筐体51の外表面53から突出して延びるとともに筐体51の内外を連通する第1の空間59を内側に有する筒状の突起52に対して固定される。
第5実施形態の通気アセンブリ1Eを図9A及び図9Bに示す。図9Bには、図9Aに示す通気アセンブリ1Eの断面B-Bが示されている。図9A及び図9Bには、筐体51の突起52に通気アセンブリ1Eが固定された状態、言い換えると、筐体51の突起52に通気アセンブリ1Eが固定された通気筐体における突起52の近傍、が示されている。図9A及び図9Bに示す通気アセンブリ1Eの分解斜視図を図10に示す。図9A、図9B及び図10に示すように、通気アセンブリ1Eは、筐体51の外表面53から突出して延びるとともに筐体51の内外を連通する第1の空間59を内側に有する筒状の突起52に対して固定される。
(実施例1)
オレフィン系熱可塑エラストマー(三井化学株式会社製ミラストマー(登録商標)、硬度71、密度880kg/m3)を材料として用いて、図11Aの形状の内部部材2を射出成型により作製した。得られた内部部材2の最大厚みは2.4mm、最小厚みは1.1mm、最大厚みを有する部分の外径は12mm、最小厚みを有する部分の外径は10mm、内径は7.5mm、高さH1は8.0mmであった。図11Aの内部部材2は、内部部材2の内部空間に突出した突起部(橋梁)62を端部11Aに有する以外は、図3A、図3B及び図4の内部部材2と同様の形状を有していた。
透湿度[gm-2h-1]=A/B/24・・・(1)
内部部材2の高さH1、突起52の高さH2、通気膜3の通気量、外部部材4の高さ、外部部材4の挿入深さ、及び内外接触長さを表1に記載の値に変更した以外は、実施例1と同様の方法により、透湿試験を実施した。透湿度の結果を表1に示す。
内部部材2及び外部部材4の形状を図13A及び図13Bに示す形状に変更した以外は、実施例1と同様の方法により、透湿試験を実施した。透湿度の結果を表1に示す。比較例7~9の内部部材2の高さH1、突起52の高さH2、通気膜3の通気量、外部部材4の高さ、外部部材4の挿入深さ、及び内外接触長さは、表1に記載のとおりである。図13Aの内部部材2は、突出部21の数が4である以外は、図9A、図9B及び図10の内部部材2と同様の形状を有していた。図13A及び図13Bの外部部材4は、爪45を有さず、開口側の端部42の位置が、通気アセンブリの中心軸に垂直な方向に見て、段差16に比べて下方にあり、かつ、内周面31から中心軸の方向に向かって突出して延びる3つの第2の突起部34を底部32の内面33に有する以外は、図9A、図9B及び図10の外部部材4と同様の形状を有していた。なお、図13A及び図13Bでは、内部部材2及び外部部材4を下方から見ている。
[通気アセンブリの準備]
実施例1と同様の方法により、内部部材の高さH1が8.0mm、外部部材の高さが9.0mm、及び外部部材の挿入深さが7.0mmである通気アセンブリAを得た。
(実施例10)
オレフィン系熱可塑エラストマー(三井化学株式会社製ミラストマー(登録商標)、硬度71、密度880kg/m3)を材料として用いて、図13Aの形状の内部部材2を射出成型により作製した。得られた内部部材2における突出部21を有する部分の厚みは4.2mm、突出部21を有さない部分(非突出部)の厚みは2.3mm、突出部21を有する部分の外径は16mm、非突出部の外径は12mm、内径は7.5mm、高さH1は6.0mmであった。
内部部材2の高さH1及び突起52の高さH2を表3に記載の値に変更した以外は、実施例10と同様の方法により、引張試験(内部部材の引抜試験)を実施した。引抜力の結果を表3に示す。
(参考例1)
オレフィン系熱可塑エラストマー(三井化学株式会社製ミラストマー(登録商標)、硬度71、密度880kg/m3)を材料として用いて、図13Aの形状の内部部材2を射出成型により作製した。得られた内部部材2における突出部21を有する部分の厚みは4.2mm、突出部21を有さない部分(非突出部)の厚みは2.3mm、突出部21を有する部分の外径は16mm、非突出部の外径は12mm、内径は7.5mm、高さH1は6.0mmであった。
突起の外径、外部部材の高さ、及び外部部材の挿入深さを表4に記載の値に変更した以外は、参考例1と同様の方法により、引張試験(外部部材の引抜試験)を実施した。引抜力の結果を表4に示す。表4の「外部部材の挿入深さ」と「内外接触長さ」は、<通気筐体の透湿試験1>において説明したとおりである。
Claims (5)
- 筐体と通気アセンブリとを備える通気筐体であって、
前記筐体は、前記筐体の外表面から突出して延びるとともに前記筐体の内外を連通する第1の空間を内側に有する筒状の突起を備え、
前記通気アセンブリは、
双方の端部に開口を有する筒状体である内部部材と、
前記内部部材の一方の前記端部における前記開口を覆う通気膜と、
有底の筒状体であり、内側に前記内部部材が前記一方の端部の側から挿入されて、挿入された状態で前記内部部材と接合する外部部材と、を備え、
前記通気アセンブリは、前記内部部材の他方の前記端部における前記開口に前記突起が挿入されて、前記内部部材の内周面と前記突起の外周面とが当接した状態で前記突起に固定されており、
前記通気アセンブリは、前記内部部材の内部、前記外部部材の内部、及び接合した前記内部部材と前記外部部材との間から選ばれる少なくとも1つに、前記通気膜と前記通気アセンブリの外部とを接続する通気路となる第2の空間を有し、
前記内部部材の高さH1が、6.0mm以上10mm以下であり、
前記突起の高さH2に対する前記内部部材の高さH1の比H1/H2が、1.00以上1.70以下であることを特徴とする、通気筐体。 - 前記突起の中心軸に垂直な平面により切断した前記第1の空間の断面の面積S1と、前記通気路としての通気方向に垂直な平面により切断した前記第2の空間の断面の面積を前記通気膜からの距離毎に合計した総面積が最小となる位置の総面積S2minとの比率S2min/S1が1.0以上である、請求項1に記載の通気筐体。
- 前記突起の中心軸に垂直な平面により切断した前記第1の空間の断面の面積S1と、前記通気アセンブリの中心軸に沿って前記他方の端部側から前記第2の空間を観察したときに、前記第2の空間が最も狭くなる位置の断面を表す平面の総面積S2outとの比率S2out/S1が1.0以上である、請求項1又は2に記載の通気筐体。
- 前記通気アセンブリの中心軸に垂直な方向に観察したときに、
前記内部部材における前記外部部材により覆われる部分の前記中心軸に沿う方向の長さが6.0mm以上8.0mm以下である、請求項1~3のいずれかに記載の通気筐体。 - 前記外部部材及び/又は前記内部部材が、前記外部部材と前記内部部材とを脱着可能に接合する係止機構を有する、請求項1~4のいずれかに記載の通気筐体。
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