WO2021014941A1 - Dispositif agitateur insonorisant - Google Patents

Dispositif agitateur insonorisant Download PDF

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Publication number
WO2021014941A1
WO2021014941A1 PCT/JP2020/026289 JP2020026289W WO2021014941A1 WO 2021014941 A1 WO2021014941 A1 WO 2021014941A1 JP 2020026289 W JP2020026289 W JP 2020026289W WO 2021014941 A1 WO2021014941 A1 WO 2021014941A1
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Prior art keywords
air
passage
holes
sound absorbing
perforated plate
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PCT/JP2020/026289
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English (en)
Japanese (ja)
Inventor
綾香 冨堂
龍之介 秋松
佐藤 広之
辰次 井手
Original Assignee
株式会社デンソー
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Priority to CN202080052362.9A priority Critical patent/CN114127840A/zh
Publication of WO2021014941A1 publication Critical patent/WO2021014941A1/fr

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    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00Methods 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
    • G10K11/16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60HARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00Heating, cooling or ventilating [HVAC] devices

Definitions

  • the present disclosure relates to a sound absorbing and stirring device that absorbs sound propagating in a fluid and agitates the fluid.
  • Patent Document 1 discloses a configuration in which a perforated plate is provided on the inner wall of a cylindrical pipe via an air layer to absorb sound propagating in the pipe.
  • the micro perforated plate is a plate-shaped member in which a plurality of fine through holes are formed, and is called MPP (abbreviation of Micro perforated Panel).
  • MPP abbreviation of Micro perforated Panel
  • Patent Document 1 takes into consideration the influence of the air blown out from the holes of the perforated plate or the air entering the air layer from the flow field through the holes of the perforated plate with respect to the air flowing in the pipe. Absent. Further, the configuration described in Patent Document 1 is intended only for reducing noise, and is not intended for stirring air flowing in the pipe. In the configuration described in Patent Document 1, if the purpose is to reduce noise and agitate the fluid, the perforated plate cannot have a great influence on the fluid, and a structure for agitating the fluid is required separately. .. Further, when a structure for stirring the fluid is separately added to the configuration described in Patent Document 1, there is a high possibility that noise will be aggravated. It is an object of the present disclosure to provide a sound absorbing and stirring device that absorbs sound propagating in air and agitates air.
  • a sound absorbing agitator that absorbs sound propagating in the air and agitates the air
  • a passage member having a passage through which air flows, and A plate-shaped member with a plurality of fine through holes, one surface facing the air flow field in the passage, and the other surface with the inner wall surface of the passage member via an air layer having a constant thickness. It is provided with a fine perforated plate which is provided so as to face each other and generates a viscous damping action by air passing through the through hole.
  • the plurality of through holes are arranged linearly in a direction orthogonal to the center line of the passage.
  • the plurality of through holes are arranged linearly in the direction orthogonal to the center line of the passage, the plurality of air vortices blown from the plurality of through holes into the flow field at substantially the same time are located on the center line of the passage.
  • a vortex core is formed in the direction orthogonal to the vortex core. Therefore, the vortex of air becomes large in the vicinity of the fine perforated plate, and the turbulence of the air flow is promoted. Therefore, this sound absorbing and stirring device can agitate the air flowing through the passage member.
  • the fine perforated plate is configured to generate a viscous damping action by air passing through a plurality of fine through holes. Therefore, this sound absorbing / stirring device can absorb the sound propagating in the air flowing through the passage member.
  • the linear shape includes, in addition to the straight line, a state in which a plurality of through holes are slightly deviated (specifically, about 1/2 of the hole diameter) due to manufacturing tolerances and the like.
  • a sound absorbing agitator that absorbs sound propagating in the air and agitates the air
  • a passage member having a passage through which air flows, and A plate-shaped member with a plurality of fine through holes, one surface facing the air flow field in the passage, and the other surface with the inner wall surface of the passage member via an air layer having a constant thickness. It is provided with a fine perforated plate which is provided so as to face each other and generates a viscous damping action by air passing through the through hole.
  • the plurality of through holes are arranged in a straight line parallel to the center line of the passage.
  • the vortex of the air blown out from the through hole on the upstream side and the air blown out from the through hole on the downstream side thereof Since the plurality of through holes are arranged in a straight line parallel to the center line of the passage, the vortex of the air blown out from the through hole on the upstream side and the air blown out from the through hole on the downstream side thereof.
  • the vortices interfere with each other, and the vortices gradually grow larger from the upstream side to the downstream side. Therefore, the vortex of air becomes large in the vicinity of the fine perforated plate, and the turbulence of the air flow is promoted. Therefore, this sound absorbing and stirring device can agitate the air flowing through the passage member. Further, since the fine perforated plate generates a viscous damping action, this sound absorbing and stirring device can absorb the sound propagating in the air flowing through the passage member.
  • FIG. 5C which shows the state which the air is flowing through the sound absorption agitation device. It is a figure following FIG. 5D which shows the state which the air is flowing through the sound absorption agitation device. It is a figure following FIG. 5E which shows the state which the air is flowing through the sound absorption agitation device. It is a figure for demonstrating the model of the experiment in the sound absorption agitation device. It is a figure which shows the state which the air is flowing through the sound absorption agitation device. It is a figure following FIG. 6B which shows the state which the air is flowing through the sound absorption agitation device. It is a figure following FIG. 6C which shows the state which the air is flowing through the sound absorption agitation device. It is a figure following FIG.
  • FIG. 6D which shows the state which the air is flowing through the sound absorption agitator. It is a figure following FIG. 6E which shows the state which the air is flowing through the sound absorption agitation device. It is a figure for demonstrating the arrangement of the through hole of the fine perforation plate and its action in the VII part of FIG. It is a figure for demonstrating the arrangement of the through hole of the fine perforation plate and its action in the VIII part of FIG. It is a figure for demonstrating the misalignment amount of the through hole of the fine perforation plate. It is a figure for demonstrating the pitch of the through hole of a fine perforation plate.
  • FIG. 11 is an arrow view in the XII direction of FIG. It is an enlarged view of the XIII part of FIG. It is a top view of the sound absorption agitation device which concerns on 3rd Embodiment. It is a top view of the sound absorption agitation device which concerns on 4th Embodiment. It is a top view of the sound absorption agitation apparatus which concerns on 5th Embodiment. It is a top view of the sound absorption agitation apparatus which concerns on 6th Embodiment.
  • the sound absorbing and stirring device of the present embodiment is installed in, for example, a vehicle air conditioner or a blowout duct to absorb sound propagating in the air and agitate the air.
  • the sound absorbing and stirring device includes a passage member 10, a fine perforated plate 20, and the like.
  • the passage member 10 has, for example, a rectangular cross section and has a passage through which air flows.
  • the cross-sectional shape of the passage member 10 is not limited to a rectangular shape, and various shapes such as a circular shape, an elliptical shape, a polygonal shape, or a combination thereof can be adopted.
  • the mainstream direction of air flowing through the passage of the passage member 10 is indicated by a white arrow.
  • the mainstream direction of the air flowing through the passage of the passage member 10 and the direction of the center line CL of the passage coincide with each other.
  • the center line CL of the passage of the passage member 10 means a virtual line that is the center of the wall surfaces facing each other among the wall surfaces forming the air flow field.
  • a fine perforated plate 20 is fixed to the inner wall of the passage member 10.
  • the fine perforated plate 20 is a plate-shaped member in which a plurality of fine through holes 21 are bored.
  • the micro perforated plate 20 is called MPP (abbreviation for Micro perforated Panel).
  • the hole diameter d of the through hole 21 is larger than 0 and 1 mm or less.
  • the fine perforated plate 20 is provided so that one surface faces the air flow field 11 in the passage and the other surface faces the inner wall surface 13 of the passage member 10 via an air layer 12 having a constant thickness. ..
  • the location where the fine perforated plate 20 is provided on the passage member 10 is not limited to one surface of the inner wall of the passage member 10, but may be a plurality of surfaces or the entire surface.
  • the fine perforated plate 20 is configured to generate a viscous damping action by air passing through a plurality of through holes 21.
  • the viscous damping action will be described.
  • a plurality of fine through holes 21 provided in the fine perforated plate 20 are considered as capillaries, the behavior of the viscous boundary layer determines whether or not the viscous damping action works. Whether or not the viscous damping action works can be examined by the acoustic Reynolds number.
  • FIG. 4 shows the diameter d of the through hole 21 and the thickness t of the viscous boundary layer. In FIG. 4, the thickness t of the viscous boundary layer is shown by hatching with a broken line.
  • Air density ⁇ [kg / m3]
  • Viscosity coefficient ⁇ [Pa ⁇ s]
  • the acoustic Reynolds number Rey is expressed by the following equation 1. If Rey ⁇ 10, the viscous damping action works.
  • the fine perforated plate 20 generates a frictional force due to the viscosity of the air between the inner wall of the through hole 21 and the air in contact with the inner wall, and the sound propagates in the air flowing through the flow field 11 of the passage member 10. Can be absorbed and attenuated.
  • the inventors have found the following as a result of intensive research on the configuration in which the fine perforated plate 20 is installed on the inner wall of the passage member 10 such as the sound absorbing and stirring device of the present embodiment via the air layer 12. did. That is, the inventors have discovered that when air flows through the air flow field 11 of the passage member 10 at a constant flow velocity, the following first state and second state are repeated at a constant cycle. is there.
  • the first state is a state in which the air in the air layer 12 is blown out to the flow field 11 through the through hole 21 of the fine perforated plate 20.
  • the second state is a state in which the air flowing through the flow field 11 enters the air layer 12 through the through hole 21.
  • FIG. 5A is a diagram for explaining a model used in the experiment of the sound absorbing and stirring device.
  • the mainstream direction of the air flowing through the flow field 11 of the passage member 10 is indicated by a white arrow.
  • the mainstream direction coincides with the center line CL of the passage of the passage member 10.
  • the plurality of through holes 21 formed in the fine perforated plate 20 are arranged in a straight line parallel to the center line CL of the passage.
  • the hole diameter d of the plurality of through holes 21 used in the experiment is 1.0 mm.
  • the distance P between the center of one through hole 21 adjacent to each other in the mainstream direction and the center of the other through hole 21 is 3 mm.
  • FIG. 5B shows a state in which the air in the air layer 12 begins to blow out into the flow field 11 through the plurality of through holes 21 after the experiment is started.
  • the air blown from the air layer 12 to the flow field 11 through the plurality of through holes 21 is visualized by fine particles arranged in the air layer 12.
  • the air in the air layer 12 begins to blow out from the plurality of through holes 21 to the flow field 11 at substantially the same time.
  • FIG. 5C shows a state following FIG. 5B. At this time, the air blown out from the air layer 12 to the flow field 11 through the plurality of through holes 21 at substantially the same time becomes vortices, and is moved to the downstream side by the wind flowing through the flow field 11.
  • FIG. 5D shows a state following FIG. 5C.
  • the air blown from the air layer 12 to the flow field 11 through the plurality of through holes 21 is the vortex of the air blown out from the through holes 21 on the upstream side and the air blown out from the through holes 21 on the downstream side thereof.
  • the vortex interferes with each other and begins to grow.
  • FIG. 5E shows a state following FIG. 5D. At this time, the vortex of air blown out from the air layer 12 to the flow field 11 through the plurality of through holes 21 gradually grows larger from the upstream side to the downstream side.
  • FIG. 5F shows a state following FIG. 5E.
  • the state in which air is blown from the air layer 12 to the flow field 11 through the plurality of through holes 21 is completed. After that, the air flowing through the flow field 11 enters the air layer 12 through the through hole 21.
  • the above-mentioned phenomenon of FIGS. 5B to 5F is repeated at a constant cycle. In this way, when air flows through the flow field 11 of the passage member 10 at a constant flow velocity, the air in the air layer 12 is blown out from the plurality of through holes 21 into the flow field 11 so as to breathe, and the flow field.
  • the state of entering the air layer 12 from 11 through the through hole 21 is repeated at a constant cycle.
  • FIG. 6A is the same diagram as FIG. 5A.
  • 6B to 6F show the same state as FIGS. 5B to 5F, and the images obtained by the above experiment are shown in gray scale.
  • the gray scale is binarized, but it is described for the sake of understanding.
  • the inventors have found that the sound absorbing and stirring device can reduce noise and stir the air flowing through the passage member 10.
  • the sound absorbing and stirring device of the present embodiment is installed in, for example, a vehicle air conditioner or an air outlet duct, the temperature and humidity of the air conditioner air blown from the air outlet provided in the vehicle interior are made uniform while reducing noise. As a result, the air conditioning performance can be improved.
  • a plurality of through holes 21 are arranged linearly in a direction orthogonal to the center line CL of the passage. Further, the distance between the inner wall surface 13 of the passage member 10 and the fine perforated plate 20 is constant, and the air layer 12 formed between the inner wall surface 13 of the passage member 10 and the fine perforated plate 20 has a constant thickness. As a result, since the fine perforated plate 20 is provided via the air layer 12 having a constant thickness, the cycle in which air is blown from the plurality of through holes 21 to the flow field 11 is synchronized. Since the plurality of through holes 21 are arranged linearly in the direction orthogonal to the center line CL of the passage, as shown by the arrow V in FIG.
  • the plurality of through holes 21 are substantially connected to the flow field 11.
  • a plurality of vortices of air blown out at the same time form a vortex core in a direction orthogonal to the center line CL of the passage. Therefore, the vortex of air becomes large in the vicinity of the fine perforated plate 20, and the turbulence of the air flow is promoted. Therefore, this sound absorbing and stirring device can agitate the air flowing through the passage member 10.
  • the plurality of through holes 21 are arranged linearly in parallel with the center line CL of the passage. Therefore, as shown by the arrow V in FIG. 8, the plurality of air vortices blown from the plurality of through holes 21 into the flow field 11 at substantially the same time interfere with each other, and the vortices gradually grow larger from the upstream side to the downstream side. To do. Therefore, the vortex of air becomes large in the vicinity of the fine perforated plate 20, and the turbulence of the air flow is promoted. Therefore, this sound absorbing and stirring device can agitate the air flowing through the passage member 10.
  • the plurality of through holes 21 are not limited to being arranged in a perfect straight line with respect to the direction parallel to the center line CL of the passage, and are parallel to the center line CL of the passage. It is also possible to arrange the through holes 21 slightly offset from each other. Specifically, the vortex Vo generated from the plurality of through holes 21 is larger than the hole diameter d of the through holes 21. Therefore, the distance S between the center of the through hole 21 on the upstream side adjacent to the mainstream direction and the center of the through hole 21 on the downstream side is within a range of 1/2 or less of the hole diameter d of the through hole 21 and is the center of the passage. It may be deviated in the direction perpendicular to the line CL.
  • the distance P between the center of the through hole 21 on the upstream side adjacent to the mainstream direction and the center of the through hole 21 on the downstream side thereof is such that the vortex generated from the through hole 21 on the upstream side is downstream.
  • the distance is set so that the vortices generated from the through holes 21 on the side can reach each other and interfere with each other. Then, the distance P can be appropriately set by an experiment or the like.
  • the second embodiment will be described.
  • the second embodiment describes a mode in which a sound absorbing / stirring device is installed in an air conditioning unit of a vehicle air conditioner.
  • the air conditioning unit 1 of the vehicle air conditioner includes an air conditioning case 2, an evaporator 4, a heater core 5, an air mix door 6, an outlet opening door 7, and the like.
  • the air conditioning case 2 is a member corresponding to the passage member 10 of the sound absorbing and stirring device.
  • the air conditioning case 2 is made of a resin (for example, polypropylene) having a certain degree of elasticity and excellent strength.
  • the air conditioning case 2 forms the outer shell of the air conditioning unit 1.
  • a passage that is, an air flow field 11
  • the air conditioning case 2 has a plurality of outlet openings 8 for blowing air into a predetermined area in the vehicle interior on the downstream side in the air flow direction of the passage.
  • an evaporator 4 Inside the air conditioning case 2, an evaporator 4, a heater core 5, an air mix door 6, a blowout opening door 7, and the like are provided.
  • the evaporator 4 is a heat exchanger for cooling the air flowing through the passage.
  • the evaporator 4 constitutes a part of a refrigeration cycle (not shown).
  • the evaporator 4 exchanges heat between the low-pressure refrigerant flowing inside the evaporator 4 and the air passing through the evaporator 4, evaporating the refrigerant and cooling the air.
  • the heater core 5 is a heat exchanger for heating the air flowing through the passage.
  • the heater core 5 exchanges heat between the engine cooling water or high-pressure refrigerant flowing inside the heater core 5 and the air passing through the heater core 5, and heats the air with the heat of the engine cooling water or high-pressure refrigerant.
  • the passage in the air conditioning case 2 includes a bypass passage 51 that bypasses the heater core 5 and allows air to flow outside the heater core 5.
  • An air mix door 6 is provided between the evaporator 4 and the heater core 5 in the passage of the air conditioning unit 1. The air mix door 6 adjusts the air volume ratio between the wind that passes through the evaporator 4 and bypasses the heater core 5 (that is, the wind that flows through the bypass passage 51) and the wind that passes through the evaporator 4 and then passes through the heater core 5. To do.
  • the blowout opening door 7 is provided in the first blowout opening 81 of one of the plurality of blowout openings 8, and adjusts the opening area of the first blowout opening 81.
  • the blowout opening door provided in the second blowout opening 82 of the other of the plurality of blowout openings 8 is omitted in FIG. 11, the first blowout is also shown in the second blowout opening 82.
  • a blowout opening door may be provided in the same manner as the opening 81.
  • the fine perforated plate 20 included in the sound absorbing and stirring device of the second embodiment is provided inside the air conditioning case 2 in order to absorb the sound propagating in the air conditioning case 2 and to stir the air flowing in the air conditioning case 2.
  • a portion where the fine perforated plate 20 is installed in the air conditioning case 2 is shown by an example of a broken line.
  • the place where the fine perforated plate 20 is installed is not limited to the place shown in FIG. 11, and may be any place among the inner walls of the air conditioning case 2.
  • the sound absorbing and stirring device improves the air conditioning performance by reducing the noise emitted from the air conditioner into the vehicle interior and making the temperature and humidity of the air conditioning air blown out from the air outlet provided in the vehicle interior uniform. Can be enhanced.
  • the sound absorbing and stirring device of the second embodiment includes a partition plate 30 for partitioning the air layer 12.
  • the fine perforated plate 20 is viewed from the air flow field 11 of the air conditioning case 2, but in order to make the figure easier to see, a partition arranged on the passage member 10 side with respect to the fine perforated plate 20.
  • the plate 30 is shown by a solid line through the fine perforated plate 20.
  • the mainstream direction of the air flow in the passage is indicated by a white arrow. This also applies to FIGS. 14 to 17 referred to in the third to sixth embodiments described later.
  • the partition plate 30 is a plate-shaped member that connects the inner wall surface of the passage member 10 (that is, the air conditioning case 2) and the fine perforated plate 20.
  • the partition plates 30 those extending in the direction orthogonal to the center line CL of the passage are referred to as the first partition plate 31.
  • the first partition plate 31 is provided so as to be arranged in a direction orthogonal to the center line CL of the passage. As a result, it is possible to more reliably synchronize the period in which air is blown out from the plurality of through holes 21 arranged linearly in the direction orthogonal to the center line CL of the passage to the flow field 11.
  • the second partition plate 32 those extending parallel to the center line CL of the passage are referred to as the second partition plate 32.
  • the second partition plate 32 is provided so as to be arranged parallel to the center line CL of the passage.
  • a plurality of sections are formed by the inner wall surface 13, the fine perforated plate 20, and the partition plate 30 of the passage member 10.
  • the number of through holes 21 provided in each section is the same for the plurality of sections. Further, in the plurality of sections, the ratio of the number of through holes 21 provided in each section to the volume of the section is the same. In addition, in the present specification, the same includes the range of manufacturing tolerance in addition to the exact same.
  • this sound absorbing and stirring device can further exert the air stirring effect by making the air vortex larger in the vicinity of the fine perforated plate 20 and promoting the turbulence of the air flow.
  • the third to sixth embodiments will be described.
  • the third to sixth embodiments are different from the first and second embodiments in the configuration of the partition plate 30, and the other parts are the same as those of the first and second embodiments. Only the part different from the second embodiment will be described.
  • a second partition plate 32 extending parallel to the center line CL of the passage is provided.
  • the first partition plate 31 extending in the direction orthogonal to the center line CL of the passage is not provided.
  • the number of through holes 21 provided in each of the plurality of sections formed by the inner wall surface 13, the fine perforated plate 20, and the partition plate 30 of the passage member 10 is the same.
  • the volume of each of the plurality of compartments is the same. Therefore, also in the third embodiment, it is possible to synchronize the cycle of air blowing from the plurality of through holes 21 to the flow field 11.
  • the fourth embodiment As shown in FIG. 15, in the fourth embodiment, among the partition plates 30, the first partition plate 31 extending in the direction orthogonal to the center line CL of the passage is provided. On the other hand, in the fourth embodiment, of the partition plates 30, the second partition plate 32 extending parallel to the center line CL of the passage is not provided.
  • the number of through holes 21 provided for each section is the same.
  • the volume of each of the plurality of compartments is the same. Therefore, also in the fourth embodiment, it is possible to synchronize the period in which air is blown from the plurality of through holes 21 to the flow field 11.
  • the first partition plate 31 extending in a direction orthogonal to the center line CL of the passage and the second partition extending parallel to the center line CL of the passage. Both plates 32 are provided.
  • the square of the alternate long and short dash line indicated by the symbol ⁇ indicates the volume of the air layer 12 assigned to one through hole 21.
  • the number of through holes 21 provided in each section is not the same.
  • the volumes of the plurality of compartments are not the same for each compartment.
  • the volume of the air layer 12 assigned to one through hole 21 is the same in the plurality of compartments. Therefore, in the plurality of sections, the ratio of the number of through holes 21 provided in each section to the volume of the section is the same. Therefore, also in the fifth embodiment, it is possible to synchronize the cycle of air blowing from the plurality of through holes 21 to the flow field 11.
  • the first partition plate 31 is formed in a predetermined wave shape, and a plurality of waves constituting the wave shape are arranged in a direction orthogonal to the center line CL of the passage. It is provided as follows. Further, the second partition plate 32 is also formed in a predetermined wave shape, and is provided so that a plurality of waves forming the wave shape are arranged in a direction orthogonal to the center line CL of the passage.
  • the number of through holes 21 provided for each section is the same. Further, the plurality of compartments have the same volume for each compartment. The ratio of the number of through holes 21 provided in each section to the volume of the section is the same in the plurality of sections. Therefore, also in the sixth embodiment, it is possible to synchronize the cycle of air blowing from the plurality of through holes 21 to the flow field 11.
  • the sound absorbing and stirring devices of the third to sixth embodiments can also exert the air stirring effect by making the air vortex larger in the vicinity of the fine perforated plate 20 and promoting the turbulence of the air flow. ..
  • the plurality of through holes 21 are arranged linearly in a direction orthogonal to the center line CL of the passage, but the present invention is not limited to this.
  • the plurality of through holes 21 may exceptionally include those arranged at positions deviated from the direction orthogonal to the center line CL of the passage.
  • the plurality of through holes 21 are arranged linearly in a direction parallel to the center line CL of the passage, but the present invention is not limited to this.
  • the plurality of through holes 21 may exceptionally include those arranged at positions deviated from the direction parallel to the center line CL of the passage.
  • the number of through holes 21 provided in each section is the same, but the number is not limited to this. A part of the through holes 21 provided in the section having different numbers of holes may be exceptionally included.
  • the volume of each section is the same, but the volume is not limited to this. A part having a different volume of the compartment may be exceptionally included.
  • the ratio of the number of through holes 21 provided in each section to the volume of the section is the same, but the present invention is not limited to this. A part having a different ratio between the number of through holes 21 provided for each section and the volume of the section may be exceptionally included.
  • the passage member has a passage through which air flows.
  • the fine perforated plate is a plate-shaped member having a plurality of fine through holes, one surface of which faces the air flow field of the passage, and the other surface of the passage through an air layer having a constant thickness. It is provided so as to face the inner wall surface of the member, and a viscous damping action is generated by the air passing through the through hole.
  • the plurality of through holes are arranged linearly in a direction orthogonal to the center line of the passage.
  • the passage member has a passage through which air flows.
  • the fine perforated plate is a plate-shaped member having a plurality of fine through holes, one surface of which faces the air flow field of the passage, and the other surface of the passage through an air layer having a constant thickness. It is provided so as to face the inner wall surface of the member, and a viscous damping action is generated by the air passing through the through hole.
  • the plurality of through holes are arranged in a straight line parallel to the center line of the passage.
  • the plurality of through holes are arranged linearly in a direction orthogonal to the center line of the passage, and are arranged linearly parallel to the center line of the passage. According to this, since the plurality of through holes are arranged linearly in the direction orthogonal to the center line of the passage, the plurality of air vortices blown from the plurality of through holes into the flow field at substantially the same time are generated in the passage.
  • the vortex core is formed in the direction orthogonal to the center line.
  • the plurality of through holes are arranged in a straight line parallel to the center line of the passage, the vortex of the air blown out from the through hole on the upstream side and the air blown out from the through hole on the downstream side thereof.
  • this sound absorbing and stirring device can exert the air stirring effect by making the air vortex larger in the vicinity of the fine perforated plate and promoting the turbulence of the air flow.
  • the sound absorbing and stirring device further includes a partition plate for partitioning the air layer.
  • the partition plate connects the inner wall surface of the passage member and the fine perforated plate. According to this, it is possible to more reliably synchronize the cycle of air blowing out from the plurality of through holes into the flow field. Therefore, this sound absorbing and stirring device can exert the air stirring effect by making the air vortex larger in the vicinity of the fine perforated plate and promoting the turbulence of the air flow.
  • the partition plates are arranged in a direction orthogonal to the center line of the passage. According to this, it is possible to more reliably synchronize the cycle of air blowing out from the plurality of through holes into the flow field.
  • the partition plates are lined up parallel to the center line of the passage. According to this, it is possible to more reliably synchronize the cycle of air blowing out from the plurality of through holes into the flow field.
  • the plurality of sections formed by the inner wall surface of the passage member, the fine perforated plate, and the partition plate have the same number of through holes provided for each section. According to this, it is possible to synchronize the period in which air is blown out from a plurality of through holes into the flow field.
  • the volume of each of the plurality of compartments formed by the inner wall surface of the passage member, the fine perforated plate and the partition plate is the same. According to this, it is possible to synchronize the period in which air is blown out from a plurality of through holes into the flow field.
  • the ratio of the number of through holes provided in each compartment to the volume of the compartment is the same. Is. According to this, it is possible to synchronize the period in which air is blown out from a plurality of through holes into the flow field. Therefore, this sound absorbing and stirring device can further exert the air stirring effect by making the vortex of air larger in the vicinity of the fine perforated plate and promoting the turbulence of the air flow.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

L'invention concerne un élément passage (10) qui comporte un passage dans lequel s'écoule de l'air. Une fine plaque perforée (20) est un élément en forme de plaque dans lequel une pluralité de trous traversants fins (21) sont perforés et est disposée de sorte qu'une de ses surfaces fasse face à un emplacement d'écoulement d'air (11) dans le passage et que son autre surface soit opposée à une surface de paroi interne (13) de l'élément passage (10) par l'intermédiaire d'une couche d'air (12) ayant une épaisseur fixe, provoquant ainsi une action d'amortissement visqueux due au passage de l'air dans les trous traversants (21). La pluralité de trous traversants (21) sont disposés en lignes droites dans des directions perpendiculaires à la ligne centrale (CL) du passage.
PCT/JP2020/026289 2019-07-22 2020-07-03 Dispositif agitateur insonorisant WO2021014941A1 (fr)

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JP2019-134789 2019-07-22
JP2019134789A JP2021018356A (ja) 2019-07-22 2019-07-22 吸音攪拌装置

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005009483A (ja) * 2003-05-23 2005-01-13 Kobe Steel Ltd 多孔板消音構造

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005009483A (ja) * 2003-05-23 2005-01-13 Kobe Steel Ltd 多孔板消音構造

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CN114127840A (zh) 2022-03-01

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