• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A sound-attenuating ventilation louver is provided for location in an aperture of a wall which separates a chamber containing a source of noise from the external environment, the purpose of the louver being to allow gaseous flows to pass into and out of the chamber while minimizing the noise passing out through the louver from the noise source. The louver includes a plurality of profiled slats each in the form of an aerodynamically-shaped blade. Each slat includes a solid portion made of a sound-absorbent material and a hollow portion defined by a thin wall of rigid material; in use of the louver the sound-absorbent solid portion of each slat is disposed towards the chamber containing the noise source while the hollow portion is disposed towards the external environment. The hollow portion of each slat is subdivided into a plurality of chambers communicating with the atmosphere through ports and acting as resonators.
    公开号:SU1069637A3
    申请号:SU802987202
    申请日:1980-10-03
    公开日:1984-01-23
    发明作者:Руспа Джакомо；Франко Луиджи
    申请人:Чентро Ричерке Фиат С.П.А. (Фирма)；
    IPC主号:
    专利说明:


    WITH
     with
    2SHZHSHSHSH%
    2. Blinds according to claim 1, characterized in that in each platinum wall, the kmts section is solid
    and the hollow part, is located parallel to the edges of the plate and Crosses the lower surface of the plate along a line lying in a horizontal plane, the passage of me tangentially to the upper surface of the adjacent plate in the area of the trailing edge.
    3. Louvers in PP 1 and 2, characterized in that the holes of the chambers are mounted on the bottom surface of the plate.
    4. Louvers are nii 1–3, differing in that the chambers of each plate form at least two groups of resonators, and the resonators of each group have a common oscillation frequency, which differs from the frequency of another group or groups of resonators.
    5. The louver of claim 4, wherein the resonators of each group are located in a respective row extending parallel to the edges of the plate.
    6. Louvers according to claim 4, characterized in that a group of resonators with the same oscillation frequency is located in a row extending parallel to the edges of the shield.
    7. blinds on PP 1-6, about t l. and that sex
    The invention relates to mechanical engineering and can be used to attenuate noise outside a building containing a noise source, for example, a test machine.
    Devices are known for attenuating noise, containing sound-attenuating ventilation louvers mounted in a wall opening separating the chamber with a source of noise from the environment and including a number of profiled plates installed in an operating position with an inclination to the chamber wall, each the plate is made in the form of an aerodynamic wing, the upper surface of which faces the environment, and the lower surface faces the chamber, and these surfaces are interconnected by means of the front side of the environment and the rear side EASURES convex edge profile 1:17
    The disadvantages of the known devices are low noise attenuation and
    a part of each plate has the same thickness, and after that the part has a thickness decreasing from the middle zone of the plate,
    8. Blinds pop, 7, characterized in that the profile of the solid part of each plate is made in the form of a horn, with the upper and lower surfaces having a double bend.
    9. Louvers according to claims 1-8, characterized in that the upper surface of the solid part of each plate is provided with a wall of rigid material and is an extension of the rigid wall of the hollow part.
    10. Blinds according to claims 1 and 2, which are different in that the distance between the upper and lower surfaces of the two adjacent plates in the zone of the hollow portions is half the distance between their back edges.
    11. Louvers according to claim 1-10, characterized in that the upper and lower surfaces of each plate in the area of the hollow part in the working position are inclined at an angle of 30 to the horizontal surface.
    12. Louvers according to claim 1-11, characterized in that the distance between two adjacent plates in the region of the hollow parts is equal to but 1/5 of the total thickness of the louver.
    the possibility of damage from environmental factors.
    The purpose of the invention is to reduce noise by improving the passage of the flow through the blinds.
    This goal is achieved by the fact that, in sound-attenuated air vents, installed in the opening of the wall separating the chamber with the source of noise from the environment, and containing a number of profiled plates installed in the working position with inclination to the wall of the chamber, each the plate is made in the form of an aerodynamic wing, the upper surface of which faces the environment, and the lower surface faces the chamber, and these surfaces are interconnected by means of front edges on the environmental side and rear edges of the chamber on the side of you uklogo profiles, each plate comprising a solid portion made of a material zvukopogloschayuscheg,
    and located between the middle zone of the plate and the rear edge, and a hollow part formed by a wall made of rigid material and located between the middle, plate zone and the leading edge, the floor part being divided into a series of chambers, each of which is connected to the atmosphere by at least one hole.
    In this case, in each plate, the wall, the kada section of the solid and hollow parts may be located parallel to the plate edges and intersects the lower surface of the plate along a line lying in a horizontal plane passing tangentially to the upper surface of the adjacent plate in the trailing edge.
    In addition, the holes of the chambers can be made in the bottom surface of the plate.
    The chambers of each plate can form at least two groups of resonators, with the resonators of each group having a common oscillation frequency different from the frequency of the other group or groups of resonators.
    In this case, the resonators of each group can be located in the corresponding series running parallel to the edges of the plate.
    A group of resonators with the same oscillation frequency can be located in a row that runs parallel to the edges of the plate.
    The floor portion of each plate may have the same thickness, and the solid portion has a thickness decreasing from the middle zone of the plate. In this case, the profile of the solid part of each plate can be made in the form of a horn, with the upper and lower surfaces having double bending.
    The surface of the solid portion of each plate may be provided with a wall of rigid material and is a continuation of the rigid wall of the hollow portion.
    The distance between the upper and lower surfaces of two adjacent ttlastins in the area of the hollow parts can be equal to half the distance between their posterior edges.
    The upper and lower surfaces of each plate in the zone of the lower part in the working position can be tilted at an angle of 30 to the horizontal surface.
    The distance between two adjacent plates in the area of the hollow parts is 1/5 of the total thickness of the louver.
    FIG. 1 shows the proposed device, a general view; in fig. 2 shows aa and aa of fig. one; in fig. 3 -; section bb in fig. 2
    The device contains louvers 1, wedge plates 2, the opposite ends of which are attached to the frame 3. Each plastic plate 2 is made in the form of an aerodynamic wing, having an upper 1 (facing the environment) and a lower II (facing the camera surface, which are connected by means of the front ha from the environment and the rear 1U from the camera edge of the convex profile.
    Each plate 2 contains splice 4 and hollow 5 parts. The solid part 4 is made of sound-absorbing material, for example, polyurethane, and extends from the longitudinal edge IV of the plate 2, which is closest to the chamber in which the source of igum is installed, to the middle zone of the plate 2.
    The floor part 5 is located between the said middle zone and the longitudinal edge of the W plate 2, which is closest to the external environment. The floor part 5 is formed by a thin wall b, made of rigid material, and is divided by partitions 7 into a number of chambers 8. Each chamber 8 communicates with the atmosphere through aperture 9 and serves as a resonator.
    The chambers 8 of the hollow part b of each plate 2 form (FIG. 2) at least two groups of resonators, each group having its own oscillation frequency. These groups of resonators can be arranged in two rows, which run parallel to the longitudinal edges and. Iv plates 2. Top surface of the APSL part. 4 plate 2 may be provided with a wall 10 of a rigid material, which is a continuation of the wall 7.
    Ventilation louvres work as they leave.
    Most of the sound waves, which are emitted by the source of noise, fall on the louver 1 and fall on the part 4, made of soundproof material, and, consequently, they lose much of their energy. These are largely attenuated sound waves reflected by part. 4 passes between adjacent platinum 2 in the direction of the outer circumference of the medium and continues to lose energy as a result of the presence of resonating chambers 8. The action of the resonators is especially enhanced at their natural frequency of oscillation. By giving appropriate dimensions to these resonating chambers 8, their natural frequency of oscillation can be achieved with the frequency of oscillation of the peak of the spectrum of the sound waves emitted by the noise source.
    In the design shown in FIGS. 2 and 3, two groups of resonators are provided, each of which has its own frequency, ko-. oscillations different from the frequency of oscillations of another group of resonators; This design option is particularly useful in the case when the emitted spectrum of the noise source has two peaks. When the emitted noise source spectrum has a different number of peaks, an appropriate number of resonator groups should be provided.
    Each group of resonators has such dimensions that the frequency oscillates corresponds to one of the peaks of the emitted spectrum.
    The channel for the passage of the air flow, which is formed between the adjacent plates 2, has a gradually increasing cross-sectional area in the direction from the outer
    environment to the camera containing the source of the noise. As a result of this shape, the channels for the passage of air flow reduce the kinetic energy of gases passing through the louvers, which allows a significant reduction in the load loss of the noise source, for example, an internal combustion engine, for which
    5 louvers serve as an air inlet.
    The device will reduce the noise level around the camera with a source of noise. d 8 7 t I d 7 87 Fig.Z 3
    权利要求:
    Claims (12)
    [1]
    1. SOUND-ATTENTION VENTILATION BLINDS t installed in the hole in the wall separating the chamber from the source! ” environmental noise, containing a number of profile plates installed in the working position with an inclination towards the chamber wall, each plate being made in the form of an aerodynamic wing, the upper surface of which faces the environment, and the lower surface - to the chamber, these surfaces are connected between each other by means of the front edges of the convex profile from the front of the environment and the rear from the side of the chamber, which are especially important in that, in order to attenuate the noise by improving the flow through the blinds, each plate contains a continuous portion made of a sound absorbing material and disposed between the middle zone and the trailing edge of the plate, and a hollow part formed by the wall, you are a $ complements of a rigid material and raspolozhonnoy between the middle zone and the front edge of the plate, wherein the hollow portion is divided into a number of chambers, each of which is connected to the atmosphere by at least one ^ hole.
    10696.37>
    [2]
    2. Blinds according to π. 1, characterized in that in each plate, the wall separating the solid and hollow parts is parallel to the edges of the plate and intersects the bottom surface of the plate along a line lying in a horizontal plane tangentially to the upper surface of the adjacent plate in the area of the trailing edge.
    [3]
    3. Blinds according to claims 1 and 2, which are characterized in that the openings of the chambers are made on the lower surface of the plate.
    -
    [4]
    4. Blinds according to claims 1 to 3, which are characterized in that the chambers of each plate form at least two groups of resonators, and the resonators of each group have a common oscillation frequency, which differs from the frequency of another group or groups of resonators.
    [5]
    5. Blinds according to claim 4, characterized in that; that the resonators of each group are located in the corresponding row, parallel to the edges of the plate.
    [6]
    6. The blinds according to claim 4, characterized in that the group of resonators with the same oscillation frequency is located in a row running parallel to the edges of the plate.
    [7]
    7. Blinds according to claims 1-6, about t l. and relying on the fact that the hollow part of each plate has the same thickness, and the solid part has a thickness that decreases from the middle zone of the plate.
    [8]
    8. Blinds pop. 7, characterized in that the profile of the solid part of each plate is made in the form of a horn, and the upper and lower surfaces have a double bend.
    [9]
    9. Blinds according to claims 1-8, characterized in that the upper surface of the solid part of each plate is provided with a wall of rigid material and is a continuation of the rigid wall of the hollow part.
    [10]
    10. Blinds for PP 1 and 2, characterized in that ras-; standing between the upper and lower surfaces of two adjacent plates in the area of the hollow parts is equal to half the distance between their trailing edges.
    [11]
    11. Blinds according to claims 1-10, characterized in that the upper and lower surfaces of each plate in the area of the hollow part in the working position are inclined at an angle of 3 (f to the horizontal surface.
    [12]
    12. The blinds according to claims 1-11, characterized in that the distance between two adjacent plates in the region of the hollow parts is equal to, but 1/5 of the total thickness of the blinds.
    12
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    同族专利:
    公开号 | 公开日
    ES253039U|1980-12-16|
    GB2065292A|1981-06-24|
    DE3036633A1|1981-04-16|
    IT1118938B|1986-03-03|
    DE3036633C2|1983-07-28|
    GB2065292B|1983-10-19|
    IT7968932D0|1979-10-05|
    SE8006745L|1981-04-06|
    US4330047A|1982-05-18|
    NL8005503A|1981-04-07|
    ES253039Y|1981-05-16|
    JPS5659986A|1981-05-23|
    FR2466824A1|1981-04-10|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    IT6893279A|IT1118938B|1979-10-05|1979-10-05|VENTILATION SHUTTER INCLUDING A PLURALITY OF PROFILED BLINDS|
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