RU2626469C1 - Single kochetov's sound absorber of combined type - Google Patents

Single kochetov's sound absorber of combined type Download PDF

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Publication number
RU2626469C1
RU2626469C1 RU2016108093A RU2016108093A RU2626469C1 RU 2626469 C1 RU2626469 C1 RU 2626469C1 RU 2016108093 A RU2016108093 A RU 2016108093A RU 2016108093 A RU2016108093 A RU 2016108093A RU 2626469 C1 RU2626469 C1 RU 2626469C1
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RU
Russia
Prior art keywords
perforated
sound
sound absorber
reactive
base
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RU2016108093A
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Russian (ru)
Inventor
Олег Савельевич Кочетов
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Олег Савельевич Кочетов
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Priority to RU2016108093A priority Critical patent/RU2626469C1/en
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Publication of RU2626469C1 publication Critical patent/RU2626469C1/en

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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74Heat, sound or noise insulation, absorption, or reflection . Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82Heat, sound or noise insulation, absorption, or reflection . Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84Sound-absorbing elements
    • E04B1/8404Sound-absorbing elements block-shaped
    • 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
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74Heat, sound or noise insulation, absorption, or reflection . Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82Heat, sound or noise insulation, absorption, or reflection . Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84Sound-absorbing elements
    • E04B2001/8414Sound-absorbing elements with non-planar face, e.g. curved, egg-crate shaped
    • E04B2001/8419Acoustical cones or the like, e.g. for anechoic chambers
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74Heat, sound or noise insulation, absorption, or reflection . Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82Heat, sound or noise insulation, absorption, or reflection . Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84Sound-absorbing elements
    • E04B2001/8457Solid slabs or blocks
    • E04B2001/8476Solid slabs or blocks with acoustical cavities, with or without acoustical filling
    • E04B2001/848Solid slabs or blocks with acoustical cavities, with or without acoustical filling the cavities opening onto the face of the element
    • E04B2001/8485Solid slabs or blocks with acoustical cavities, with or without acoustical filling the cavities opening onto the face of the element the opening being restricted, e.g. forming Helmoltz resonators

Abstract

FIELD: machine engineering.
SUBSTANCE: single sound absorber of the combined type contains the sound absorbers of active and reactive types, placed on the rigid frame. The frame is made of two parts. The bottom reactive part is made as rigid, hollow structure of cylindrical-and-cone shape, and the top active part is made as rigid perforated cylindrical shell with perforated cover and solid base. The cavity of the cylindrical shell is filled with the sound absorbing material, and the connection between the top and bottom parts is made by means of the elastic damping element, providing the damping of high-frequency oscillations. The element is hingedly connected to the perforated cover of the perforated cylindrical shell, using it the frame is fixed to the required facility, for example, to the ceiling of the production room. At least one screw sound absorbing element in the form of the cylindrical coil spring, enclosing the shell in the bottom reactive frame part, is mounted around the perforated cylindrical shell. The cylindrical part is made hollow in the form of the resonance Helmholtz suppressor with the resonator necks of different diameters, located in the cover and base of the hollow cylinder, and also on its lateral surface. The cavity of the conical part is the Helmholtz resonator with the neck, located at the base of the cylinder. At the same time, in the conical part cavity of the reactive sound absorber of cylinder-conical form, placed on the rigid frame and representing the Helmholtz resonator with the neck, located at the base of the hollow cylinder, there is the additional sound absorber, made in the form of the spherical surface, fixed by means of at least two braces with adjustable lengths, rigidly fixed on the hollow cylinder base. There is the gap between the spherical surface of the additional sound absorber and the internal conical surface of the reactive sound absorber conical part, the value of which is determined, depending on the required degree of the noise reduction level. The outer screw surface of the screw sound-absorbing element is perforated, and the spherical surface of the additional sound absorber, fixed by at least two length-adjustable braces on the base of the hollow cylinder is perforated, and the cavity of the additional sound absorber is filled with the sound absorbing material.
EFFECT: efficiency improvement of the noise suppression at high frequencies by introducing the volumetric cavities for Helmholtz resonators into the single piece sound absorber, that increase the efficiency at high frequencies.
1 dwg

Description

The invention relates to noise reduction in industrial and transport facilities.
The closest technical solution to the technical nature and the achieved result is a piece sound absorber according to the patent of the Russian Federation No. 2485256 [prototype], containing a rigid perforated frame, inside which a sound-absorbing material is placed, the frame is made of the lower part of the conical shape with a cover, and the upper part of the cylindrical shape, which attached to the cover of the lower part of the perforated frame by means of a vibration damping pad, which allows damping high-frequency vibrations, while to the upper part of the cylinder An element of the perforated carcass is pivotally fixed by means of which the carcass is fixed to the desired object, for example, the ceiling of the production room, and the cavities of the lower and upper parts of the perforated carcass are filled with sound-absorbing materials of different densities, with at least one sound-absorbing screw around the upper part of the cylindrical shape of the perforated carcass piece absorber element made in the form of a cylindrical coil spring from a dense non-combustible sound absorber oschayuschego material.
The disadvantage of this piece sound absorber is the relatively low noise reduction efficiency at low and medium frequencies due to the lack of volume cavities for Helmholtz resonators and cavities filled with a sound absorber, i.e. absorbers of various densities.
EFFECT: increased efficiency of sound attenuation at high frequencies by introducing volume cavities for Helmholtz resonators into a piece sound absorber, which increase efficiency at high frequencies.
This is achieved by the fact that in a unit-type sound absorber of a combined type containing active and reactive type absorbers placed on a rigid frame, the frame is made of two parts, the lower, reactive part being made in the form of a rigid hollow cylinder-conical structure, and the upper, active, the part is made in the form of a rigid perforated cylindrical shell with a perforated lid and a solid base, and the cavity of the cylindrical shell is filled with sound-absorbing material, and the connection is vertical it and the lower parts are made by means of an elastic damping element that allows damping high-frequency vibrations, while the element is pivotally fixed to the perforated cover of the perforated cylindrical shell, by which the frame is attached to the desired object, for example, the ceiling of the production room, while at least around the perforated cylindrical shell one screw sound-absorbing element.
The drawing shows a diagram of a piece sound absorber of a combined type.
A combined type sound absorber contains a rigid frame, which is made of two parts, the lower 1, reactive, part made in the form of a rigid hollow cylinder-shaped structure, and the upper 14, active, part made in the form of a rigid perforated cylindrical shell 12 with a perforated cover and a solid base, and the cavity of the cylindrical shell is filled with sound-absorbing material. The connection of the upper 14 and lower 1 parts is made by means of an elastic damping element 13, which allows damping high-frequency vibrations, while an element is pivotally fixed to the perforated cover of the perforated cylindrical shell, by which the frame is attached to the desired object, for example, the ceiling of the production room. Around the perforated cylindrical shell 12 is located at least one screw sound-absorbing element 15, made in the form of a cylindrical helical spring, covering the shell 12.
In the lower 1, reactive part of the frame, the cylindrical part 2 is hollow in the form of a Helmholtz resonant silencer with resonator necks 5, 6, 7 of different diameters located in the cover 4 and base 3 of the hollow cylinder, as well as on its side surface, and the cavity of the conical part 11 is a Helmholtz resonator with a neck 6 located in the base 3 of the cylinder.
In the cavity of the conical part 11 of the cylinder-conical reactive sound absorber located on the rigid frame 1 and consisting of a Helmholtz resonator with a neck 6, located at the base 3 of the hollow cylinder, there is an additional sound absorber 16 made in the form of a spherical surface fixed by at least two length-adjustable stretch marks 17, rigidly fixed to the base 3 of the hollow cylinder, while between the spherical surface of the additional sound absorber 16 and the inner the conical surface of the conical part 11 of the reactive sound absorber has a gap, the value of which is determined depending on the required degree of noise reduction level.
The screw sound-absorbing element 15 is made in the form of a hollow screw sound-absorbing element formed by the external and internal screw surfaces forming a cavity (not shown in the drawing), while the space formed by the external and internal screw surfaces is filled with sound-absorbing material (not shown in the drawing) with a density less than the screw sound-absorbing element 15.
The inner walls of the hollow skeleton of the cylindrical-conical shape are made rigid, for example, in the conical part 11, the surface 9, and the outer 8 are perforated, and the space between them is filled with a sound absorber 10.
A unit sound absorber of a combined type operates as follows.
Sound waves propagating in industrial or transport facilities interact with sound-absorbing material 10 located in the lower 1 part of the frame, as well as in a perforated cylindrical shell 12 and a screw sound-absorbing element 15 of the upper 14 parts, which suppress noise in different frequency bands, for example, at low and mid frequencies respectively.
The connection of the upper 14 and lower 1 parts by means of an elastic damping element 13, allows you to damp high-frequency vibrations that can be emitted by a rigid frame, which allows it to be used to reduce noise on transport objects.
Sound absorption at medium and high frequencies occurs due to the acoustic effect built on the principle of Helmholtz resonators formed by air cavities of a perforated frame. In the lower 1, reactive part of the frame, the cylindrical part 2 is hollow in the form of a Helmholtz resonant silencer with resonator necks 5, 6, 7 of different diameters, with different volumes of resonant cavities: in the lower part of the conical shape, cavity 11, and in the cylindrical cavity 2, serve to suppress sound vibrations in the required sound frequency range, as a rule large volumes for noise suppression in the low-frequency range, and small volumes in the medium and high frequencies. An additional sound absorber 16, made in the form of a spherical surface, fixed by means of at least two length-adjustable stretch marks 17, rigidly fixed to the base 3 of the hollow cylinder, suppresses high-frequency sound vibrations in the spectrum.
It is possible that the outer screw surface of the screw sound-absorbing element 15 is perforated.
It is possible that the spherical surface of the additional sound absorber 16, fixed by at least two length-adjustable stretch marks 17, on the base 3 of the hollow cylinder 2, is perforated, and the cavity of the additional sound absorber 16 is filled with sound-absorbing material.

Claims (1)

  1. A combined type sound absorber containing active and reactive sound absorbers placed on a rigid frame, the frame is made of two parts, while the lower, reactive part is made in the form of a rigid hollow cylinder-shaped structure, and the upper, active part is made in the form of a rigid perforated a cylindrical shell with a perforated lid and a solid base, and the cavity of the cylindrical shell is filled with sound-absorbing material, and the connection of the upper and lower parts is made This is done by means of an elastic damping element that allows damping high-frequency vibrations, while the element is pivotally fixed to the perforated cover of the perforated cylindrical shell, by which the frame is attached to the desired object, for example, the ceiling of the production room, while at least one screw sound-absorbing element is located around the perforated cylindrical shell made in the form of a cylindrical coil spring, covering the shell, in the lower, reactive, part of casing, the cylindrical part is made hollow in the form of a Helmholtz resonant silencer with the neck of the resonator of different diameters located in the lid and base of the hollow cylinder, and also on its side surface, and the cavity of the conical part is a Helmholtz resonator with a neck located in the base of the cylinder, characterized in that in the cavity of the conical part of the reactive sound absorber of a cylindrical shape, placed on a rigid frame and representing a Helmholtz resonator with a neck, located at the base of the hollow cylinder, there is an additional sound absorber made in the form of a spherical surface fixed by at least two length-adjustable stretch marks rigidly fixed to the base of the hollow cylinder, while between the spherical surface of the additional sound absorber and the inner conical surface of the conical part of the reactive the sound absorber there is a gap, the value of which is determined depending on the required degree of noise reduction level, while the external I helical surface of the screw sound absorbing member is perforated, and the spherical surface of the additional sound absorbing embodied by at least two adjustable length extensions based on hollow cylinder is perforated, and the cavity is filled with additional sound absorbing sound absorbing material.
RU2016108093A 2016-03-09 2016-03-09 Single kochetov's sound absorber of combined type RU2626469C1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU838029A1 (en) * 1979-09-26 1981-06-15 Научно-Исследовательский Институтстроительной Физики Госстроя Cccp Resonance-type absorber
SU1617110A2 (en) * 1988-03-22 1990-12-30 Ереванский политехнический институт им.К.Маркса Resonant sound absorber
US5137111A (en) * 1990-07-26 1992-08-11 Diduck Murray F Acoustic absorber, and method of manufacture thereof
US7451855B2 (en) * 2007-01-09 2008-11-18 Samw Hong Jen Wang Acoustic absorbing device
RU2541956C1 (en) * 2014-02-26 2015-02-20 Олег Савельевич Кочетов Single kochetov's acoustic absorber of combined type

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU838029A1 (en) * 1979-09-26 1981-06-15 Научно-Исследовательский Институтстроительной Физики Госстроя Cccp Resonance-type absorber
SU1617110A2 (en) * 1988-03-22 1990-12-30 Ереванский политехнический институт им.К.Маркса Resonant sound absorber
US5137111A (en) * 1990-07-26 1992-08-11 Diduck Murray F Acoustic absorber, and method of manufacture thereof
US7451855B2 (en) * 2007-01-09 2008-11-18 Samw Hong Jen Wang Acoustic absorbing device
RU2541956C1 (en) * 2014-02-26 2015-02-20 Олег Савельевич Кочетов Single kochetov's acoustic absorber of combined type

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