WO2023074199A1 - 通風型消音器 - Google Patents
通風型消音器 Download PDFInfo
- Publication number
- WO2023074199A1 WO2023074199A1 PCT/JP2022/035066 JP2022035066W WO2023074199A1 WO 2023074199 A1 WO2023074199 A1 WO 2023074199A1 JP 2022035066 W JP2022035066 W JP 2022035066W WO 2023074199 A1 WO2023074199 A1 WO 2023074199A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- opening structure
- ventilated
- sound absorbing
- vent pipe
- inlet
- Prior art date
Links
- 238000009423 ventilation Methods 0.000 title claims abstract description 67
- 230000003584 silencer Effects 0.000 title claims abstract description 57
- 239000011358 absorbing material Substances 0.000 claims abstract description 90
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 230000002093 peripheral effect Effects 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims description 52
- 230000007246 mechanism Effects 0.000 claims description 28
- 239000002344 surface layer Substances 0.000 claims description 28
- 239000004745 nonwoven fabric Substances 0.000 claims description 25
- 229920005989 resin Polymers 0.000 claims description 23
- 239000011347 resin Substances 0.000 claims description 23
- 238000010521 absorption reaction Methods 0.000 claims description 9
- 230000000052 comparative effect Effects 0.000 description 22
- 239000006260 foam Substances 0.000 description 7
- -1 etc.) Polymers 0.000 description 6
- 229920000728 polyester Polymers 0.000 description 6
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 5
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 5
- 230000030279 gene silencing Effects 0.000 description 5
- 239000012528 membrane Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000004800 polyvinyl chloride Substances 0.000 description 4
- 229920000915 polyvinyl chloride Polymers 0.000 description 4
- 230000032258 transport Effects 0.000 description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Natural products C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- 229920002284 Cellulose triacetate Polymers 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 2
- 239000004918 carbon fiber reinforced polymer Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000011152 fibreglass Substances 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920000747 poly(lactic acid) Polymers 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 239000004626 polylactic acid Substances 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000002990 reinforced plastic Substances 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 229920002972 Acrylic fiber Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229920002943 EPDM rubber Polymers 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229920001410 Microfiber Polymers 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 229930182556 Polyacetal Natural products 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004697 Polyetherimide Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229920003027 Thinsulate Polymers 0.000 description 1
- 239000004789 Thinsulate Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- VNTLIPZTSJSULJ-UHFFFAOYSA-N chromium molybdenum Chemical compound [Cr].[Mo] VNTLIPZTSJSULJ-UHFFFAOYSA-N 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000003658 microfiber Substances 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000011120 plywood Substances 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 229920001601 polyetherimide Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 230000001743 silencing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 210000003437 trachea Anatomy 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/161—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general in systems with fluid flow
-
- 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
-
- 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
- F24F13/24—Means for preventing or suppressing noise
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
Definitions
- the present invention relates to a ventilated silencer.
- a vent pipe that transports gas
- it is installed in the middle of the vent pipe as a muffler that silences noise from the gas supply source, etc. in the middle of the vent pipe, and has an expanded part with a larger cross-sectional area than the vent pipe.
- utensils are known.
- a ventilated muffler having an expanded part by arranging a horn-shaped member whose cross-sectional area gradually expands toward the inside of the expanded part at the entrance to the expanded part, the flow of air flowing into the expanded part is prevented from being disturbed. It is known to suppress and enhance the silencing effect.
- Patent Document 1 in a muffler in which an inlet pipe and a tail pipe (outlet pipe) are inserted into an expanded portion, the expanded portions of the inlet pipe and the tail pipe inserted into the expanded portion are tapered (horn-shaped). ), bell mouths are formed at the openings of the inlet pipe and the tail pipe, and the bell mouths are provided so as to face each other.
- Patent Document 2 in an expandable muffler, an exhaust lead-out pipe is brought into contact with the lower surface of the inner wall of a hollow body (expanded portion), and a small hole or a fine hole is formed in a portion of the exhaust lead-out pipe that is in contact with the lower surface of the inner wall of the hollow body. It is described that the water in the hollow body (extended portion) is discharged by forming a large number of them.
- An object of the present invention is to solve the above-described problems of the prior art, and to provide a ventilated silencer capable of draining water from the expanded portion and suppressing the generation of wind noise.
- the challenge is to
- the problem to be solved by not providing a through hole for drainage according to the present invention is to prevent wind noise from being generated due to disturbance of the air flow due to the through hole.
- This problem is the same for any ventilated silencer, even if it is not an extended ventilated silencer. That is, even in a ventilated muffler that does not have a horn-shaped member, if a through hole is provided for drainage, the flow of air flowing through the ventilated muffler is disturbed by the through hole, resulting in wind noise. A problem arises.
- An additional problem to be solved when the drainage mechanism of the present invention is further provided is to be able to drain water from the inside of the ventilated silencer to the outside when the through hole is not provided in the ventilated silencer.
- An additional object of the present invention is to further improve drainage performance when using a material with low water absorption or no water absorption as the base material of the sound absorbing material inside the ventilated silencer. . As a result, it is possible to reduce the amount of moisture remaining inside the ventilated muffler, thereby reducing the occurrence of mold and the like.
- a ventilated muffler having an opening structure on an inlet side and an outlet side, A ventilated muffler in which the opening structure has a drainage mechanism on part of the edge.
- an inlet-side vent pipe an expanded portion that communicates with the inlet-side vent pipe and has a larger cross-sectional area than the inlet-side vent pipe, an outlet-side vent pipe that communicates with the expanded portion and has a smaller cross-sectional area than the expanded portion, an opening structure in which the cross-sectional area gradually increases from the connecting portion toward the inside of the expanding portion in at least one of the connection portion with the inlet side ventilation pipe and the connection portion with the outlet side ventilation pipe of the expansion portion; a sound absorbing material disposed at least between the inner peripheral surface of the extension and the tip of the opening structure;
- the opening structure has a notch in a part of the peripheral surface from the tip toward the root side, A ventilated muffler in which the width of the notch gradually widens from the base to the tip.
- a porous sound absorbing material has a base material made of resin and a surface layer made of resin nonwoven fabric on the surface of the base material, The ventilated silencer according to [4], wherein the porous sound absorbing material is arranged so that the surface layer faces the opening structure side.
- the central axis of the inlet-side ventilation pipe and the central axis of the outlet-side ventilation pipe are arranged parallel to the vertical direction,
- a ventilation muffler that is capable of draining water from the inside of the extension and that can suppress the generation of wind noise.
- a type silencer can be provided.
- a ventilator silencer capable of draining water from the inside of the ventilator silencer to the outside without providing a through hole that tends to generate wind noise.
- the drainage performance can be further improved. .
- FIG. 1 is a sectional view conceptually showing an example of a ventilation silencer of the present invention
- FIG. FIG. 2 is a perspective view schematically showing an example of an opening structure of the ventilated muffler shown in FIG. 1
- 3 is a front view of the opening structure shown in FIG. 2
- FIG. 3 is a side view of the aperture structure shown in FIG. 2
- FIG. 11 is a perspective view schematically showing another example of an opening structure
- 6 is a front view of the opening structure shown in FIG. 5
- FIG. 6 is a side view of the aperture structure shown in FIG. 5
- FIG. 2 is a perspective view conceptually showing an example of a porous sound absorbing material included in the ventilation silencer shown in FIG. 1.
- FIG. 3 is a perspective view schematically showing an opening structure of a ventilated silencer of a comparative example;
- FIG. 3 is a perspective view schematically showing a porous sound absorbing material included in a ventilated silencer of a comparative example; It is a figure for demonstrating the measuring method of a wind speed. It is a figure for demonstrating the measuring method of a silencing volume.
- FIG. 11 is a perspective view schematically showing an opening structure having another example of a drainage mechanism;
- FIG. 11 is a perspective view schematically showing an opening structure having another example of a drainage mechanism;
- FIG. 11 is a perspective view schematically showing an opening structure having another example of a drainage mechanism;
- perpendicular and parallel means within a range of less than ⁇ 10° with respect to strict perpendicularity or parallelism, and the error with respect to strict perpendicularity or parallelism is 5° or less is preferable, and 3° or less is more preferable.
- the terms “same” and “same” shall include the margin of error generally accepted in the technical field.
- the ventilated silencer of the present invention is A ventilated muffler having an opening structure on an inlet side and an outlet side,
- the opening structure is a ventilated muffler with a drainage mechanism on part of the edge.
- one embodiment of the ventilated silencer of the present invention is an inlet-side vent pipe, an expanded portion that communicates with the inlet-side vent pipe and has a larger cross-sectional area than the inlet-side vent pipe, an outlet-side vent pipe that communicates with the expanded portion and has a smaller cross-sectional area than the expanded portion, an opening structure in which the cross-sectional area gradually increases from the connecting portion toward the inside of the expanding portion in at least one of the connection portion with the inlet side ventilation pipe and the connection portion with the outlet side ventilation pipe of the expansion portion; a sound absorbing material disposed at least between the inner peripheral surface of the extension and the tip of the opening structure;
- the opening structure has a notch in a part of the peripheral surface from the tip toward the root side, The width of the notch is gradually widened from the root side to the tip of the ventilated muffler.
- the ventilated silencer of the present invention has a structure in which the sound absorbing material is a porous sound absorbing material.
- the porous sound absorbing material has a base material made of a resin and a surface layer made of a resin nonwoven fabric on the surface of the base material, and the porous sound absorbing material has a surface layer side is arranged toward the opening structure side.
- FIG. 1 is a schematic cross-sectional view showing an example of an embodiment of the ventilated silencer of the present invention.
- the ventilated muffler 10 includes a cylindrical inlet-side vent pipe 12, an extension portion 14 connected to one open end surface of the inlet-side vent pipe 12, and an inlet-side vent portion of the extension portion 14. It has a tubular outlet vent tube 16 , a first opening structure 20 , a second opening structure 24 , and a porous sound absorbing material 30 connected to the end face opposite the trachea 12 .
- the outlet-side ventilation pipe 16 is arranged vertically below the expanded portion 14, and the inlet-side ventilation pipe 12 is arranged above the expanded portion 14 in the vertical direction. That is, in the example shown in FIG. 1, the vertical direction is the vertical direction. In the illustrated example, air flows through the ventilated silencer from top to bottom in the figure. In other words, the direction of air flow in the ventilation muffler coincides with the vertical direction.
- the inlet-side vent pipe 12 is a cylindrical member, and transports the gas that has flowed in from one open end face to the expanded portion 14 connected to the other open end face.
- the outlet-side vent pipe 16 is a cylindrical member, and transports the gas that has flowed in from one open end face connected to the expanded portion 14 to the other open end face.
- the cross-sectional shapes of the inlet-side vent pipe 12 and the outlet-side vent pipe 16 may be circular, rectangular, triangular, and other various shapes.
- the cross-sectional shape of the vent pipe may not be uniform in the axial direction of the central axis of the vent pipe.
- the diameter of the vent tube may vary in the axial direction.
- the inlet-side vent pipe 12 and the outlet-side vent pipe 16 may have the same cross-sectional shape and cross-sectional area, or may have different shapes and/or cross-sectional areas.
- the inlet-side vent pipe 12 and the outlet-side vent pipe 16 are arranged so that their central axes are aligned, but this is not a limitation, and the central axis of the inlet-side vent pipe 12 and the center axis of the outlet-side ventilation pipe 16 may be misaligned.
- the size (cross-sectional area, etc.) of the inlet-side ventilation pipe 12 and the outlet-side ventilation pipe 16 may be appropriately set according to the size of the equipment in which the ventilation type muffler is used, the required ventilation performance, and the like.
- the inlet-side ventilation pipe 12 and the outlet-side ventilation pipe 16 are arranged so that air flows downward in the vertical direction. That is, the central axes of the inlet-side ventilation pipe 12 and the outlet-side ventilation pipe 16 are arranged parallel to the vertical direction.
- the expansion part 14 is arranged between the inlet-side vent pipe 12 and the outlet-side vent pipe 16 and transports the gas flowing in from the inlet-side vent pipe 12 to the outlet-side vent pipe 16 .
- the expanded portion 14 has a cross-sectional area perpendicular to the flow path direction larger than the cross-sectional area of the inlet-side vent pipe 12 and larger than the cross-sectional area of the outlet-side vent pipe 16 . That is, for example, when the cross-sectional shapes of the inlet-side vent pipe 12, the outlet-side vent pipe 16, and the expanded portion 14 are circular, the diameter of the cross-section of the expanded portion 14 is the same as that of the inlet-side vent pipe 12 and the outlet-side larger than the diameter of the vent tube 16.
- the cross-sectional shape of the extension part 14 may be circular, rectangular, triangular, or any other shape. Further, the cross-sectional shape of the extended portion 14 may not be uniform in the axial direction of the central axis of the extended portion 14 . For example, the diameter of the extension 14 may vary in the axial direction.
- the size (length, cross-sectional area, etc.) of the extension part 14 may be appropriately set according to the size of the equipment in which the ventilated silencer is used, the required noise reduction performance, and the like.
- a first opening structure 20 is arranged at the connection position of the expansion part 14 with the inlet-side ventilation pipe 12
- a second opening structure 24 is arranged at the connection position of the expansion part 14 with the outlet-side ventilation pipe 16 .
- a porous sound absorbing material 30 is arranged along the inner circumferential surface of the extension portion 14 .
- the porous sound absorbing material 30 is arranged at least between the inner peripheral surface of the expansion part 14 and the tip of the opening structure, and absorbs and muffles sound.
- the porous sound absorbing material is arranged along the inner peripheral surface of the expanded portion 14 over the entire area of the vent pipe in the central axis direction. That is, the length of the porous sound absorbing material 30 in the direction of the flow path substantially matches the length of the expansion portion 14 in the direction of the flow path.
- the thickness of the porous sound absorbing material 30 in the direction perpendicular to the direction of the flow path does not overlap with the thickness of the ventilation pipe when viewed from the direction of the flow path.
- the porous sound absorbing material 30 has a thickness that contacts the maximum diameter portion of the first opening structure 20 and the maximum diameter portion of the second opening structure 24 .
- the porous sound absorbing material 30 may have a cylindrical shape along the peripheral surface of the extended portion 14 .
- the porous sound absorbing material 30 may have a square tube shape along the peripheral surface of the extension part 14 .
- the porous sound absorbing material 30 has a base material 31 made of resin and a surface layer 32 made of resin nonwoven fabric on the surface of the base material 31 . As shown in FIG. 1, the porous sound absorbing material 30 is arranged with the surface layer 32 side facing the first opening structure 20 and the second opening structure 24 side.
- the base material 31 of the porous sound absorbing material 30 is not particularly limited, and conventionally known porous sound absorbing materials made of resin can be appropriately used.
- foams made of resin such as polyester, synthetic rubber sponge (EPDM type), foaming materials (urethane foam (e.g. Calmflex F manufactured by INOAC, urethane foam manufactured by Hikarisha, etc.), soft urethane foam, phenolic foam, melamine
- urethane foam e.g. Calmflex F manufactured by INOAC, urethane foam manufactured by Hikarisha, etc.
- soft urethane foam phenolic foam
- melamine Various known porous sound absorbing materials such as foams, polyamide foams, etc.
- non-woven fabrics can be used.
- the surface layer 32 of the porous sound absorbing material 30 is not particularly limited, and conventionally known resin nonwoven fabrics can be used as appropriate.
- non-woven fabric sound absorbing materials microfiber non-woven fabric (e.g., 3M company Thinsulate, etc.), polyester non-woven fabric (e.g., Tokyo Soundproof Co., Ltd. White Qon), and plastic non-woven fabrics such as acrylic fiber non-woven fabrics, natural materials such as wool and felt Fiber nonwoven fabric), etc., various known nonwoven fabrics can be used.
- porous sound absorbing materials having a base material and a surface layer of nonwoven fabric examples include QonPET manufactured by Bridgestone KBG Co., Ltd. (base material: polyester nonwoven fabric, surface layer: polyester nonwoven fabric), Calmflex F manufactured by INOAC Co., Ltd. (base material: urethane, surface layer: polyester nonwoven fabric), IMAO sound absorbing board (base material: urethane, surface layer: PVC (polyvinyl chloride) nonwoven fabric), and the like.
- base material and the surface layer are made of nonwoven fabric, the layer with the higher density is regarded as the surface layer.
- the water absorption rate of the resin that forms the base material 31 of the porous sound absorbing material 30 is preferably 0.5% or less, more preferably 0.3% or less.
- resins include polyester resins and melamine resins.
- the first opening structure 20 is arranged in contact with the connecting portion with the inlet-side vent pipe 12 in the expanded portion 14, and the opening area gradually expands from the inlet-side vent pipe 12 side toward the outlet-side vent pipe 16 side. It is a tapered cylindrical member that
- the shape and area of the opening of the first opening structure 20 on the side of the inlet-side ventilation pipe 12 substantially match the cross-sectional shape and cross-sectional area of the inlet-side ventilation pipe 12 .
- the end face (hereinafter also referred to as the tip) of the first opening structure 20 on the side of the outlet-side ventilation pipe 16 does not touch the peripheral surface of the expanded portion 14 .
- the end face of the first opening structure 20 on the side of the outlet-side ventilation pipe 16 is in contact with the porous sound absorbing material 30 arranged along the inside of the peripheral surface of the expanded portion 14 .
- the second opening structure 24 is arranged in contact with the connection portion with the outlet side ventilation pipe 16 in the expanded portion 14, and the opening area gradually decreases from the side of the inlet side ventilation pipe 12 toward the side of the outlet side ventilation pipe 16. It is a tapered cylindrical member that
- the shape and area of the opening of the second opening structure 24 on the outlet side ventilation pipe 16 side substantially match the cross-sectional shape and cross-sectional area of the outlet side ventilation pipe 16 .
- the end face (tip) of the second opening structure 24 on the side of the inlet-side ventilation pipe 12 does not touch the peripheral surface of the expanded portion 14 .
- the end face of the second opening structure 24 on the side of the inlet side vent pipe 12 is in contact with the porous sound absorbing material 30 arranged along the inside of the peripheral surface of the expanded portion 14 .
- each of the first opening structure 20 and the second opening structure 24 has notches (20a, 24a) in a part of the peripheral surface from the tip toward the root side.
- FIG. 2 shows a perspective view of the second opening structure 24 of the ventilated muffler 10 shown in FIG.
- FIG. 3 shows a front view of the second opening structure 24 shown in FIG. 2
- FIG. 4 shows a side view. 2 to 4, the second opening structure 24 will be illustrated and explained as a representative, but the first opening structure 20 also has the same configuration.
- the notch corresponds to the drainage mechanism in the present invention.
- the second opening structure 24 is a trumpet-shaped cylindrical member whose cross-sectional area gradually expands from the root side to the tip side, and the tip is formed on a part of the peripheral surface. It has a notch portion 24a formed toward the root side. That is, the cutout portion 24a is open at the tip side. Moreover, as shown in the figure, the width of the notch portion 24a gradually widens from the root side to the tip side. Also, in the illustrated example, the second opening structure 24 has two notches 24a at positions facing each other.
- the second opening structure 24 has two cutouts 24a, but is not limited to this, and the opening structure has one cutout. It may be a configuration, or a configuration having three or more notches. For example, in the example shown in FIGS. 5-7, the second opening structure 24 has four notches 24a. The four cutouts 24a are formed at equal intervals in the circumferential direction of the opening structure.
- the ventilated muffler with the expansion chamber has a horn-shaped member (opening structure) whose cross-sectional area gradually expands toward the inside of the expansion section at the entrance to the expansion section. It is known to improve the noise reduction effect by suppressing the disturbance of the flow of air flowing in or being discharged.
- the ventilated silencer is used in equipment such as air conditioners and humidifiers that allow passage of high-humidity air, the inside of the ventilated silencer deteriorates due to humidity or mold occurs due to moisture. Since the risk of this is increased, it is necessary to drain the water that accumulates inside the expansion portion to the outside. Therefore, it has been considered to form a through hole in the exhaust lead-out pipe connected to the extended portion.
- the ventilated muffler of the present invention shown in FIG. A part of the peripheral surface has a notch from the tip toward the root side.
- the cutouts in the opening structure allow water that collects in the extension to drain out of the vent tube.
- the outlet-side ventilation pipe 16 is arranged vertically below the extension part 14, and the second opening structure 24 connected to the outlet-side ventilation pipe 16 has the notch 24a. , the water W accumulated in the expanded portion 14 flows into the outlet-side ventilation pipe 16 through the notch portion 24a of the second opening portion structure 24 and is discharged.
- the width of the opening structure gradually widens from the root side toward the tip, and the opening has a cut portion that is open at the tip, so that the opening is closed. Disturbance of the flow of air flowing through the opening structure can be suppressed, and wind noise can be suppressed, as compared with the case where the through holes are formed.
- the ventilated muffler of the present invention shown in FIG. 1 includes a porous sound absorbing material having a base material and a surface layer made of nonwoven fabric, which is arranged between the inner peripheral surface of the extension and the tip of the opening structure.
- the surface layer side of the porous sound absorbing material is arranged facing the opening structure side. That is, it arrange
- the high-density surface layer which does not easily absorb water, on the side where high-humidity wind flows, the amount of water entering the expanded portion can be reduced and moisture absorption can be prevented.
- the ventilated silencer of the present invention since the main body of the ventilated silencer or the opening structure has no through holes, the flow of air flowing through the opening structure is disturbed by the through holes and wind noise is generated. There is no problem that it will be done. Unless it is used in equipment such as air conditioners and humidifiers that allow passage of high-humidity air, problems such as deterioration of the inside of the ventilated silencer due to humidity and the generation of mold due to moisture do not occur.
- a moisture-absorbing sheet is provided at the opening on the inlet side and/or the outlet side, A practical countermeasure is to install a moisture absorbent inside the ventilated silencer.
- the ventilated muffler 10 has the first opening structure 20 and the second opening structure 24, but is not limited to this, and has at least one of the opening structures. It's fine if you do.
- the structure may have the first opening structure 20 and the second opening structure 24, and only one of the opening structures may have a notch.
- the opening structure arranged on the vertically lower surface of the extended portion 14 may have a notch. preferable. That is, as in the example shown in FIG. 1, in the case where the outlet-side ventilation pipe 16 is arranged vertically downward, the second opening structure 24 connected to the outlet-side ventilation pipe 16 is notched. 24a, and in the case of a configuration in which the inlet-side vent pipe 12 is arranged vertically downward, the first opening structure 20 connected to the inlet-side vent pipe 12 has a notch portion 20a. is preferred.
- the porous sound absorbing material 30 is configured to be arranged over the entire area of the expanded portion 14 in the direction of the flow path, but the present invention is not limited to this.
- the porous sound absorbing material 30 may be arranged at least at the tip of the opening structure in the direction of the flow path, for example, from the tip of the first opening structure 20 to the tip of the second opening structure 24. It may be arranged in between.
- the porous sound absorbing material may be arranged on the entire circumferential surface of the extended portion, but it is not necessary to arrange the porous sound absorbing material on the entire surface of the extended portion in the circumferential direction.
- the thickness of the porous sound absorbing material may be changed for each location, and, for example, the porous sound absorbing material arranged on the two facing surfaces may be a thin porous sound absorbing material.
- the cutout portion of the opening structure faces the porous sound absorbing material. It is preferably arranged to As a result, the area in which the wind contacts the porous sound absorbing material increases, and the sound absorbing effect is further improved.
- the depth (length in the axial direction) of the notch is preferably 1.0 to 0.1, more preferably 0.9 to 0.2, and more preferably 0.8, with the height of the opening structure being 1. ⁇ 0.3 is more preferred.
- the width of the notch at the tip is preferably 5 to 1, more preferably 3 to 1.2, and even more preferably 2 to 1.1, where 1 is the base width of the opening structure.
- the width of the notch portion is a substantially V-shaped shape that expands at a constant rate from the root side toward the tip, but the width is limited to this. is not done.
- the rate at which the width widens from the root side toward the tip may vary.
- it may have a shape in which the width increases stepwise.
- the shape of the opening without the notch is circular on the end face on the side of the ventilation pipe, and the diameter is inside the expanded portion.
- the shape of a horn-shaped (trumpet-shaped) shape that is, the shape of a cross-sectional portion in a cross-section parallel to the flow direction (central axis)
- the shape of the cross-sectional portion of the opening structure parallel to the flow path direction may be linear.
- the shape of the cross-sectional portion of the opening structure parallel to the flow path direction may have a concave portion toward the central axis side.
- the shape of the cross-sectional portion in the cross section parallel to the flow path direction of the opening structure has, along the central axis, a portion where the diameter monotonically increases, a constant portion, and a portion where the diameter monotonously increases, in order. It may have a shape that gradually increases in diameter.
- the shape of the opening structure without the notch is circular in cross section perpendicular to the central axis.
- the shape of the cross section perpendicular to the central axis of the opening structure is not limited, and may be elliptical, rectangular, or polygonal. Regardless of the shape of the cross section perpendicular to the central axis of the opening structure, it is sufficient that the area of the cross section perpendicular to the central axis gradually increases from the connecting portion toward the inside of the expanding portion.
- the cross-sectional shape perpendicular to the central axis of the aperture structure is preferably similar to the cross-sectional shape of the extension.
- the ventilated muffler is configured so that the flow path direction is parallel to the vertical direction, but the configuration is not limited to this.
- the ventilated muffler may be arranged so that the flow path direction is oblique to the vertical direction, or may be arranged so that the flow path direction is perpendicular to the vertical direction.
- the cutout portion of the opening structure is preferably formed at the lower position in the vertical direction.
- Materials for forming the vent pipe, extension part, and opening structure include metal materials, resin materials, reinforced plastic materials, carbon fiber, and the like.
- metal materials include metal materials such as aluminum, titanium, magnesium, tungsten, iron, steel, chromium, chromium molybdenum, nichrome molybdenum, and alloys thereof.
- resin materials include acrylic resin (PMMA), polymethyl methacrylate, polycarbonate, polyamideoid, polyarylate, polyetherimide, polyacetal, polyetheretherketone, polyphenylene sulfide, polysulfone, polyethylene terephthalate, and polybutylene.
- PET Terephthalate
- PET polyimide
- TAC triacetyl cellulose
- PP polypropylene
- PE polyethylene
- PS polystyrene
- ABS resin acrylonitrile, butadiene, styrene copolymer synthetic resin
- flame-retardant ABS resin ASA Resin materials
- resins acrylonitrile, styrene, acrylate copolymer synthetic resins
- PVC polyvinyl chloride
- PLA polylactic acid
- reinforced plastic materials include carbon fiber reinforced plastics (CFRP) and glass fiber reinforced plastics (GFRP).
- a resin material is preferably used as the material for the ventilated silencer from the viewpoints of weight reduction and ease of molding. Moreover, as described above, it is preferable to use a material with high rigidity from the viewpoint of sound insulation in the low frequency range. From the viewpoint of weight reduction and sound insulation, the density of the members constituting the ventilated silencer is preferably 0.5 g/cm 3 to 2.5 g/cm 3 .
- the ventilated silencer has an extension part and a sound absorbing material (porous sound absorbing material) as a sound deadening mechanism.
- the resonator is formed by the space surrounded by the outer surface of the opening structure (the surface opposite to the central axis) and the wall surface of the extension, and the opening of this space. may be formed. That is, the ventilated muffler shown in FIG. 1 can have a resonator as a muffling mechanism in addition to the extension portion and the sound absorbing material.
- the expansion part is a mechanism that silences sound by reflecting sound waves by changing the impedance by suddenly changing (enlarging or contracting) the flow path area.
- the resonators are air column resonators, Helmholtz resonators, etc., and are mechanisms that use sound resonance to muffle sound.
- the sound absorbing material is a mechanism that muffles sound by converting sound energy of incident sound waves into heat energy.
- Sound absorbing materials include, in addition to the porous sound absorbing materials described above, plate-like materials (membrane materials), microperforated plates, molded sound absorbing plates, flexible materials, and the like.
- a plate-like material is a plate-like or film-like member such as plywood, canvas (cloth woven with thick threads), film, and sheet.
- a plate-like member (membrane member) absorbs sound by converting sound energy into heat energy due to vibration caused by plate vibration (membrane vibration) when a sound wave collides with the plate-like member (membrane material).
- a microperforated plate is a plate-like member with holes such as a perforated board or punching metal. It absorbs sound.
- a molded sound absorbing plate is formed by molding a fibrous member such as resin fiber such as rock wool, glass wool, or polyester into a high-density plate by high-compression processing.
- a molded sound absorbing plate is a porous plate-like member, when a sound wave hits the molded sound absorbing plate inside, the air in the gap vibrates and friction heats the sound energy. It absorbs sound by converting it into energy.
- the flexible material is a flexible material with low rigidity such as a rubber sheet, and when hit by a sound wave, it vibrates and converts the sound energy into heat energy by friction, thereby absorbing the sound.
- the porous sound absorbing material 30 is configured to have the base material 31 and the surface layer 32, but is not limited to this, and may be a single-layer porous sound absorbing material.
- the single-layer porous sound absorbing material the porous sound absorbing material mentioned above as the base material and the surface layer, woven fabric, non-woven fabric, etc. can be used as appropriate.
- the ventilated silencer of the present invention only needs to have at least one of the extension part, the sound absorbing material, and the resonator as the sound deadening mechanism.
- the opening structure is a horn-shaped member whose cross-sectional area gradually expands from the root to the tip, but the present invention is not limited to this.
- the aperture structure may be a straight tubular member as shown in FIG.
- the opening structure 36 shown in FIG. 13 is a straight tubular member, and has a drainage mechanism 36a at the edge on the tip side.
- a drainage mechanism 36a shown in FIG. 13 is a notch portion whose width gradually widens from the tip side toward the root side, as in the example shown in FIG. 1 and the like.
- the opening structure has a notch portion as a drainage mechanism, the width of which gradually widens from the root side to the tip side, but the present invention is not limited to this.
- the drainage mechanism may be formed on a part of the edge of the opening structure.
- 14 and 15 each show a perspective view schematically showing an opening structure having another example of the drainage mechanism.
- the opening structure 36 shown in FIG. 14 is a straight tubular member, and has a drainage mechanism 36a at the edge on the tip side.
- the drainage mechanism 36a is a notch with a constant width that extends from the tip side toward the root side.
- the drainage mechanism may be a notch of constant width.
- the opening structure 36 shown in FIG. 15 is a straight tubular member, and has a drainage mechanism 36a at the edge on the tip side.
- a drainage mechanism 36a shown in FIG. 15 is a notch portion whose width gradually widens from the tip side toward the root side.
- the drainage mechanism 36a of the opening structure 36 shown in FIG. (when viewed from the direction perpendicular to ) is an isosceles triangle.
- the drainage mechanism 36a of the opening structure 36 shown in FIG. is a right-angled triangle.
- the drainage mechanism can have various shapes.
- a 3D printer manufactured by XYZ Printing Co., Ltd. was used to produce an extension part with ABS resin.
- the extension part was a rectangular parallelepiped with a size of 80 mm ⁇ 80 mm and a length of 150 mm.
- the thickness of the ABS resin was 2 mm.
- holes of ⁇ 34 mm were made on both sides of the extended portion, and hoses with an inner diameter of ⁇ 30 mm and a thickness of 2 mm were connected as inlet and outlet vent pipes.
- a 15 mm thick porous sound absorbing material (QonPET manufactured by Bridgestone KBG Co., Ltd.) was placed along the inner wall.
- a ventilated muffler was produced in which air was present in a 50 mm ⁇ 50 mm region in the expanded portion and a 15 mm porous sound absorbing material was present on the outer circumference of the air.
- the porous sound absorbing material had a base material made of polyester resin and a surface layer of non-woven fabric, and the base material was arranged facing the inner wall side of the expanded portion.
- Comparative Example 2 A ventilated silencer was produced in the same manner as in Comparative Example 1, except that the porous sound absorbing material was changed to (sound absorbing board manufactured by IMAO).
- This porous sound absorbing material has a base material made of urethane resin and a surface layer of non-woven fabric.
- the nonwoven fabric surface layer of the porous sound absorbing material is perpendicular to the direction of the flow path, and a plurality of porous sound absorbing materials are laminated in the direction of the flow path.
- a ventilated silencer was manufactured.
- Comparative Example 4 A ventilated silencer was produced in the same manner as in Comparative Example 3, except that the porous sound absorbing material was changed to (sound absorbing board manufactured by IMAO).
- Comparative Example 7 As shown in FIG. 9, a ventilated muffler was produced in the same manner as in Comparative Example 1, except that one through hole of 10 mm ⁇ 10 mm was formed on the root side of the opening structure.
- Comparative Example 8 A ventilated silencer was produced in the same manner as in Comparative Example 7, except that the porous sound absorbing material was changed to (sound absorbing board manufactured by IMAO).
- Comparative Example 9 As shown in FIG. 10, the nonwoven fabric surface layer of the porous sound absorbing material is perpendicular to the direction of the flow path, and the same procedure as in Comparative Example 7 is performed except that a plurality of porous sound absorbing materials are stacked in the direction of the flow path. A ventilated silencer was manufactured.
- Comparative Example 10 A ventilated silencer was produced in the same manner as in Comparative Example 9, except that the porous sound absorbing material was changed to (sound absorbing board manufactured by IMAO).
- Example 1 A ventilation muffler was produced in the same manner as in Comparative Example 1, except that four V-shaped cutouts having a depth of 40 mm and a width of 50 mm at the tip were formed in the opening structure at equal intervals in the circumferential direction.
- Example 2 A ventilated silencer was produced in the same manner as in Example 1, except that the porous sound absorbing material was changed to (sound absorbing board manufactured by IMAO).
- an inlet hose 208 is connected to the inlet pipe side of the ventilation muffler, and two blower fans (Sanyo Denki San Ace DC A blower (model number 9BMC24P2G001)) 204 was placed.
- a rectifying plate 206 was connected so that air from a blower fan 204 driven at a rotational speed of 7000 rpm would flow into an inlet-side hose 208 .
- a 30 cm outlet hose 212 was connected to the outlet pipe of the ventilation muffler, and an anemometer (TM-413 manufactured by Tenmars) 214 was connected to the tip of the outlet hose 212 .
- a 2-m inlet hose 208 is connected to the inlet pipe of the ventilation muffler, and two blower fans (Sanyo Denki San Ace DC blower (model number 9BMC24P2G001)) 204 was placed.
- a rectifying plate 206 was connected so that air from a blower fan 204 driven at a rotational speed of 7000 rpm would flow into an inlet-side hose 208 .
- a 3-m outlet-side hose 210 was connected to the outlet-side ventilation pipe, and the tip of the outlet-side hose 210 was placed inside the reverberation chamber 202 .
- Four measurement microphones were installed in the reverberation chamber 202 .
- Comparative Examples 1 to 4 have poor drainage properties because the opening structure does not have a notch.
- Comparative Examples 3 and 4 since the porous sound absorbing material is arranged horizontally, the wind comes into contact with the base material and the flow is disturbed, and it is understood that the ventilation performance and the noise reduction volume are deteriorated.
- Comparative Examples 7 to 10 since the opening structure has holes, the drainage property is improved, but the air flow is disturbed by the holes and wind noise is generated, so it is understood that the silencing volume is poor.
- Example 2 From the comparison between Example 1 and Example 2, it can be seen that the lower the water absorption rate of the resin that is the base material of the porous sound absorbing material, the better the drainage performance. From the above results, the effect of the present invention is clear.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Fluid Mechanics (AREA)
- Exhaust Silencers (AREA)
Abstract
Description
この課題は、通風型消音器であれば、拡張型の通風型消音器でなくても、同様である。すなわち、ホーン状部材を有しない通風型消音器であっても、排水のために貫通孔を設けると、通風型消音器を流れる空気の流れが、貫通孔によって乱れて風切り音が発生してしまうという問題が生じる。
本発明の更なる付加的な課題は、通風型消音器内部の吸音材の母材として吸水率が低いまたは吸水性がない材料を使う場合には、排水性を更に向上することができることである。これにより、通風型消音器内部に滞留する水分を減少することが可能となり、カビの発生等を低減することができる。
[1] 通風型消音器であって、入口側および出口側に開口部構造を有し、
開口部構造が、縁部の一部に排水機構を有する、通風型消音器。
[2] 入口側通気管と、入口側通気管と連通し入口側通気管よりも断面積が大きい拡張部と、拡張部と連通し、拡張部よりも断面積が小さい出口側通気管と、
拡張部の入口側通気管との接続部および出口側通気管との接続部の少なくとも一方に、接続部から拡張部内に向かって、断面積が漸次拡大する開口部構造と、
少なくとも拡張部の内周面と開口部構造の先端との間に配置される吸音材と、を有し、
開口部構造は、周面の一部に先端から根元側に向かって切り込み部を有し、
切り込み部の幅は、根元側から先端に向かって漸次広がっている、通風型消音器。
[3] 拡張部の入口側通気管との接続部および出口側通気管との接続部の両方に、開口部構造を有する、[2]に記載の通風型消音器。
[4] 吸音材が多孔質吸音材である、[2]または[3]に記載の通風型消音器。
[5] 多孔質吸音材が、樹脂からなる母材と、母材の表面の、樹脂不織布からなる表層とを有し、
多孔質吸音材は、表層側が開口部構造側に向けて配置されている、[4]に記載の通風型消音器。
[6] 多孔質吸音材の母材となる樹脂の吸水率が0.5%以下である、[5]に記載の通風型消音器。
[7] 入口側通気管の中心軸と出口側通気管の中心軸とが一致しており、
多孔質吸音材は、拡張部の内周面に沿って中心軸方向の全域に配置される、[4]~[6]のいずれかに記載の通風型消音器。
[8] 多孔質吸音材が、開口部構造の最大径部と接している、[4]~[7]のいずれかに記載の通風型消音器。
[9] 入口側通気管の中心軸および出口側通気管の中心軸が、鉛直方向に平行に配置され、
拡張部の鉛直方向の下側の側面に切り込み部を有する開口部構造が配置される、[2]~[8]のいずれかに記載の通風型消音器。
[10] 開口部構造は、貫通孔を有さない、[1]~[9]のいずれかに記載の通風型消音器。
また、本発明の好適実施形態によれば、通風型消音器内部に配置する吸音材の母材として吸水率が低い又は吸水性がない材料を使うことにより、排水性を更に向上することができる。これにより、通風型消音器内部に滞留する水分を減少することが可能となり、カビの発生等を低減することができる。
以下に記載する構成要件の説明は、本発明の代表的な実施態様に基づいてなされるが、本発明はそのような実施態様に限定されるものではない。
なお、本明細書において、「~」を用いて表される数値範囲は、「~」の前後に記載される数値を下限値および上限値として含む範囲を意味する。
また、本明細書において、「垂直」および「平行」とは、本発明が属する技術分野において許容される誤差の範囲を含むものとする。例えば、「垂直」および「平行」とは、厳密な垂直あるいは平行に対して±10°未満の範囲内であることなどを意味し、厳密な垂直あるいは平行に対しての誤差は、5°以下であることが好ましく、3°以下であることがより好ましい。
本明細書において、「同一」、「同じ」は、技術分野で一般的に許容される誤差範囲を含むものとする。
本発明の通風型消音器は、
通風型消音器であって、入口側および出口側に開口部構造を有し、
開口部構造が、縁部の一部に排水機構を有する、通風型消音器である。
入口側通気管と、入口側通気管と連通し入口側通気管よりも断面積が大きい拡張部と、拡張部と連通し、拡張部よりも断面積が小さい出口側通気管と、
拡張部の入口側通気管との接続部および出口側通気管との接続部の少なくとも一方に、接続部から拡張部内に向かって、断面積が漸次拡大する開口部構造と、
少なくとも拡張部の内周面と開口部構造の先端との間に配置される吸音材と、を有し、
開口部構造は、周面の一部に先端から根元側に向かって切り込み部を有し、
切り込み部の幅は、根元側から先端に向かって漸次広がっている、通風型消音器である。
図1は、本発明の通風型消音器の実施態様の一例を示す模式的な断面図である。
切り込み部は、本発明における排水機構に相当する。
一方で、通風型消音器が空調機および加湿器等の湿度の高い空気を通過させる機器に用いられる場合には、水分により通風型消音器内部が湿度で劣化したり、カビが発生したりするおそれが高くなるため、拡張部内に溜まる水を外部に排出する必要がある。そのため、拡張部に接続される排気導出管に貫通孔を形成することが考えられている。
空調機および加湿器等の湿度の高い空気を通過させる機器に用いられる場合でなければ、水分により通風型消音器内部が湿度で劣化したり、カビが発生したりする問題は生じない。
空調機および加湿器等の湿度の高い空気を通過させる機器に用いられる場合であっても、それ以外の場合であっても、入口側および/または出口側の開口部に吸湿シートを設けたり、通風型消音器内部に吸湿剤を設置するという対応策も実用可能である。
また、例えば、矩形の拡張部において対面する二面に多孔質吸音材を配置し、残りの二面には配置しない構成の場合には、開口部構造の切り欠き部が多孔質吸音材に対面するように配置されることが好ましい。これにより、風が多孔質吸音材に接する面積が増えて、吸音効果がより向上する。
また、切り欠き部の、先端における幅は、開口部構造の根元幅を1として5~1が好ましく、3~1.2がより好ましく、2~1.1がさらに好ましい。
吸音材としては、上述した多孔質吸音材に加えて、板状材料(膜状材料)、微細穿孔板、成形吸音板、および、柔軟材料等が挙げられる。
微細穿孔板は、有孔ボード、パンチングメタル等の穴を有する板状部材で、孔部分に音波が当たると孔部分に存在する空気が振動して摩擦によって音エネルギーを熱エネルギーに変換することで吸音するものである。
成形吸音板は、ロックウール、グラスウール、ポリエステル等の樹脂繊維などの繊維状の部材を高圧縮加工により高密度の板状に成型したものである。このような成形吸音板は、多孔質な板状部材となるため、多孔質吸音材と同様に、音波が内部に成形吸音板に当たると、空隙内の空気が振動して摩擦によって音エネルギーを熱エネルギーに変換することで吸音する。
柔軟材料は、ゴムシート等の剛性の低い柔軟な材料であり、音波が当たると、自身が振動して摩擦によって音エネルギーを熱エネルギーに変換することで吸音するものである。
開口部構造は、図13に示すような直管状の部材であってもよい。
図14~図15にそれぞれ、排水機構の他の例を有する開口部構造を模式的に表す斜視図を示す。
図13に示す開口部構造36が有する排水機構36aは、端側から根元側に向かって、幅が周方向に等間隔で広がる形状、すなわち、切り欠き部を平面視した場合(図13中紙面に垂直な方向からみた場合)の形状が二等辺三角形となる形状である。一方、図15に示す開口部構造36が有する排水機構36aは、端側から根元側に向かって、幅が周方向の一方の側に広がる形状、すなわち、切り欠き部を平面視した場合の形状が直角三角形となる形状である。
このように、排水機構は、種々の形状とすることができる。
3Dプリンター(XYZプリンティング社製)を用いて、ABS樹脂で拡張部を作製した。拡張部は、大きさ80mm×80mm、長さ150mmの直方体形状とした。ABS樹脂の厚みは2mmとした。また、拡張部の両側面にΦ34mmの穴をあけ、入口側通気管および出口側通気管として内径Φ30mm、厚み2mmのホースを接続した。
多孔質吸音材を、(吸音ボード IMAO製)に変更した以外は比較例1と同様にして通風型消音器を作製した。この多孔質吸音材は、ウレタン樹脂からなる母材と不織布の表層とを有する。
多孔質吸音材を、図10に示すように、不織布の表層が流路方向と直交するようにし、多孔質吸音材を流路方向に複数積層して配置した以外は比較例1と同様にして通風型消音器を作製した。
多孔質吸音材を、(吸音ボード IMAO製)に変更した以外は比較例3と同様にして通風型消音器を作製した。
図9に示すように、開口部構造の根元側に、10mm×10mmの貫通孔を1つ形成した以外は、比較例1と同様にして通風型消音器を作製した。
多孔質吸音材を、(吸音ボード IMAO製)に変更した以外は比較例7と同様にして通風型消音器を作製した。
多孔質吸音材を、図10に示すように、不織布の表層が流路方向と直交するようにし、多孔質吸音材を流路方向に複数積層して配置した以外は比較例7と同様にして通風型消音器を作製した。
多孔質吸音材を、(吸音ボード IMAO製)に変更した以外は比較例9と同様にして通風型消音器を作製した。
開口部構造に深さ40mm、先端での幅50mmのV字形状の切り欠き部を周方向に等間隔に4つ形成した以外は、比較例1と同様にして通風型消音器を作製した。
多孔質吸音材を、(吸音ボード IMAO製)に変更した以外は実施例1と同様にして通風型消音器を作製した。
<排水性>
作製した通風型消音器の拡張部内に水100mLを入れ、通風型消音器の重量を測定しておき、入口側通気管から、温度25℃、湿度50%RH、流速1m/sの風を流し水分残量が1mLになるまでの日数を以下の基準で評価した。
・A:7日以下
・B:7日超10日以下
・C:10日超
図11に示すように、通風型消音器の入口側通気管側には、入り口側ホース208を接続し、入り口側ホース208の先端側に2台のブロアファン(山洋電気社製San Ace DCブロア(型番9BMC24P2G001))204を配置した。回転数7000rpmで駆動させたブロアファン204からの送風が入り口側ホース208に流入するように形成された整流板206を接続した。通風型消音器の出口側通気管には、30cmの出口側ホース212を接続し、出口側ホース212の先端には風速計(Tenmars社製風速・風量計TM-413)214を接続した。
(通風量)=(風速計の風速)×(風速計の受風面積)
・A:0.7m3/min以上
・B:0.7m3/min未満
図12に示すように、通風型消音器の入口側通気管に2mの入り口側ホース208を接続し、入り口側ホース208の先端側に2台のブロアファン(山洋電気社製San Ace DCブロア(型番9BMC24P2G001))204を配置した。回転数7000rpmで駆動させたブロアファン204からの送風が入り口側ホース208に流入するように形成された整流板206を接続した。また、出口側通気管に3mの出口側ホース210を接続し、出口側ホース210の先端を残響室202内に配置した。残響室202内に計測用マイクロフォンを4本設置した。
通風型消音器を配置せず、入り口側ホース208と出口側ホース210とを直接接続した状態をリファレンスとして、各実施例および比較例のリファレンスの音圧レベルとの差を消音量としてそれぞれ求め、消音量の最大値を以下の基準で評価した。
・A:5dB以上
・B:4dB以上5dB未満
・C:4dB未満
結果を表1に示す。なお、表1中、多孔質吸音材の配置は、表層が開口部構造側に向けた配置される場合を「縦配置」とし、表層が流路方向に垂直に配置される場合を「横配置」とした。
比較例1~4は、開口部構造が切り欠き部を有さないため、排水性が悪いことがわかる。また、比較例3、4は、多孔質吸音材が横配置であるため、風が母材に接して流れが乱れ、通風性および消音量が悪くなることがわかる。
比較例7~10は、開口部構造が孔を有するため排水性は向上するものの、孔によって風の流れが乱れて風切り音が発生するため消音量が悪くなることがわかる。
以上の結果より本発明の効果は明らかである。
12 入口側通気管
14 拡張部
16 出口側通気管
20 第1開口部構造
22 第1背面空間
24 第2開口部構造
26 第2背面空間
30 多孔質吸音材
31 母材
32 表層
36 開口部構造
36a 切り欠き部(排水機構)
Claims (10)
- 通風型消音器であって、入口側および出口側に開口部構造を有し、
前記開口部構造が、縁部の一部に排水機構を有する、通風型消音器。 - 入口側通気管と、前記入口側通気管と連通し前記入口側通気管よりも断面積が大きい拡張部と、前記拡張部と連通し、前記拡張部よりも断面積が小さい出口側通気管と、
前記拡張部の前記入口側通気管との接続部および前記出口側通気管との接続部の少なくとも一方に、前記接続部から前記拡張部内に向かって、断面積が漸次拡大する開口部構造と、
少なくとも前記拡張部の内周面と前記開口部構造の先端との間に配置される吸音材と、を有し、
前記開口部構造は、周面の一部に先端から根元側に向かって切り込み部を有し、
前記切り込み部の幅は、根元側から先端に向かって漸次広がっている、通風型消音器。 - 前記拡張部の前記入口側通気管との接続部および前記出口側通気管との接続部の両方に、前記開口部構造を有する、請求項2に記載の通風型消音器。
- 前記吸音材が多孔質吸音材である、請求項2または3に記載の通風型消音器。
- 前記多孔質吸音材が、樹脂からなる母材と、前記母材の表面の、樹脂不織布からなる表層とを有し、
前記多孔質吸音材は、前記表層側が前記開口部構造側に向けて配置されている、請求項4に記載の通風型消音器。 - 前記多孔質吸音材の前記母材となる樹脂の吸水率が0.5%以下である、請求項5に記載の通風型消音器。
- 前記入口側通気管の中心軸と前記出口側通気管の中心軸とが一致しており、
前記多孔質吸音材は、前記拡張部の内周面に沿って前記中心軸方向の全域に配置される、請求項4に記載の通風型消音器。 - 前記多孔質吸音材が、前記開口部構造の最大径部と接している、請求項4に記載の通風型消音器。
- 前記入口側通気管の中心軸および前記出口側通気管の中心軸が、鉛直方向に平行に配置され、
前記拡張部の鉛直方向の下側の側面に前記切り込み部を有する前記開口部構造が配置される、請求項2または3に記載の通風型消音器。 - 前記開口部構造は、貫通孔を有さない、請求項1~3のいずれか一項に記載の通風型消音器。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202280071243.7A CN118235002A (zh) | 2021-10-26 | 2022-09-21 | 通风型消音器 |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021174496 | 2021-10-26 | ||
JP2021-174496 | 2021-10-26 | ||
JP2022108149 | 2022-07-05 | ||
JP2022-108149 | 2022-07-05 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US18/632,651 Continuation US20240255178A1 (en) | 2021-10-26 | 2024-04-11 | Air passage type silencer |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2023074199A1 true WO2023074199A1 (ja) | 2023-05-04 |
Family
ID=86159788
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2022/035066 WO2023074199A1 (ja) | 2021-10-26 | 2022-09-21 | 通風型消音器 |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2023074199A1 (ja) |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS498630U (ja) * | 1972-04-27 | 1974-01-24 | ||
JPS50139813U (ja) * | 1974-05-10 | 1975-11-18 | ||
JPS59184315U (ja) | 1983-05-27 | 1984-12-07 | カルソニックカンセイ株式会社 | 消音器 |
JPS61184808A (ja) | 1985-02-12 | 1986-08-18 | Murata Mfg Co Ltd | 電子部品の製造方法 |
JPS61184808U (ja) * | 1985-05-09 | 1986-11-18 | ||
JPH0481507A (ja) * | 1990-07-20 | 1992-03-16 | Yukio Nakamura | エンジンの排気マフラー |
JPH0642328A (ja) * | 1992-07-20 | 1994-02-15 | Osaka Gas Co Ltd | 消音器 |
JP2002070526A (ja) * | 2000-08-31 | 2002-03-08 | Sango Co Ltd | 消音器 |
US6588545B1 (en) * | 1999-02-05 | 2003-07-08 | Ok-no Lee | Muffler for internal combustion engine |
KR101315767B1 (ko) * | 2011-11-09 | 2013-10-10 | 현대자동차주식회사 | 차량용 머플러 장치 |
-
2022
- 2022-09-21 WO PCT/JP2022/035066 patent/WO2023074199A1/ja active Application Filing
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS498630U (ja) * | 1972-04-27 | 1974-01-24 | ||
JPS50139813U (ja) * | 1974-05-10 | 1975-11-18 | ||
JPS59184315U (ja) | 1983-05-27 | 1984-12-07 | カルソニックカンセイ株式会社 | 消音器 |
JPS61184808A (ja) | 1985-02-12 | 1986-08-18 | Murata Mfg Co Ltd | 電子部品の製造方法 |
JPS61184808U (ja) * | 1985-05-09 | 1986-11-18 | ||
JPH0481507A (ja) * | 1990-07-20 | 1992-03-16 | Yukio Nakamura | エンジンの排気マフラー |
JPH0642328A (ja) * | 1992-07-20 | 1994-02-15 | Osaka Gas Co Ltd | 消音器 |
US6588545B1 (en) * | 1999-02-05 | 2003-07-08 | Ok-no Lee | Muffler for internal combustion engine |
JP2002070526A (ja) * | 2000-08-31 | 2002-03-08 | Sango Co Ltd | 消音器 |
KR101315767B1 (ko) * | 2011-11-09 | 2013-10-10 | 현대자동차주식회사 | 차량용 머플러 장치 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
RU2425989C2 (ru) | Звукопоглощающее проточно-канальное устройство | |
US11493232B2 (en) | Silencing system | |
JP5615360B2 (ja) | 空気調和機 | |
WO2021171710A1 (ja) | 消音装置、及び、送気システム | |
US11841163B2 (en) | Silencing system | |
WO2014006650A1 (ja) | 空気調和機の室内機、及びこの室内機を備えた空気調和機 | |
JP2019053284A (ja) | 消音システム | |
US20240183569A1 (en) | Air passage type silencer | |
WO2023074199A1 (ja) | 通風型消音器 | |
JP2019133122A (ja) | 消音システム | |
US20240255178A1 (en) | Air passage type silencer | |
CN118235002A (zh) | 通风型消音器 | |
WO2023181519A1 (ja) | 消音器付き風路 | |
WO2023181520A1 (ja) | 消音器付き風路 | |
KR101979378B1 (ko) | 스플리터 및 이를 포함하는 소음기 | |
WO2024062743A1 (ja) | 消音器付き風路 | |
WO2023062966A1 (ja) | 通気システム | |
JP7249475B1 (ja) | 消音器付き風路 | |
WO2023062965A1 (ja) | 通気システム | |
WO2024070160A1 (ja) | 通風型消音器 | |
WO2024090076A1 (ja) | 消音器付き風路 | |
JP2019132576A (ja) | 消音換気構造 | |
JP7411084B2 (ja) | 消音装置 | |
CN117859171A (zh) | 通风型消音器 | |
WO2023032618A1 (ja) | 通気路用消音器 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22884770 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2023556200 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2022884770 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 2022884770 Country of ref document: EP Effective date: 20240527 |