RU2305157C1 - Air duct with acoustic covering - Google Patents

Abstract

FIELD: venting systems, particularly noise-reduction of industrial ventilation and conditioning systems.

SUBSTANCE: air duct includes a number of box-like sections connected with each other by locking devices. The sections are made of light-weight sound-absorbing structures having perforated linings and facings filled with sound-absorbing filler. The filler is made of sound-absorbing materials. Facings and linings have perforation factor of not less than 0.25. Sound-absorbing filler thickness is within optimal range, namely within 20-50 mm. Covering is made of stainless steel or galvanized sheet with 0.7 mm thickness and has polymeric protective-and-decorative coating having thickness depending on coating type. Covering may be also made of aluminum sheet of 1.0 mm thickness and may be covered with 25 μm coating.

EFFECT: decreased aerodynamic and structural noise, simplified assembling and disassembling and increased comfort in rooms.

Description

The invention relates to ventilation and air conditioning of industrial premises, in particular to noise reduction elements of ventilation and air conditioning systems of industrial enterprises.

The closest technical solution to the claimed object is the duct ventilation system and air conditioning as. USSR No. 1114756, class EB04 1/84; B24F 7/04, 1982 (prototype) made of box sections connected by locking devices and containing acoustic cladding.

The disadvantages of the known duct are the low sound-insulating ability and the excitation of bending vibrations of the walls, as a result of which the channels are sources of aerodynamic and structural noise.

EFFECT: reduction of aerodynamic and structural noise, simplification of installation and dismantling, and provision of increased comfort in rooms.

This is achieved by the fact that in the duct with acoustic cladding of the ventilation and air conditioning system of industrial premises made of box sections connected by means of locking devices, the sections are made of lightweight sound-absorbing structures containing perforated internal and external claddings filled with sound absorbers from sound-absorbing materials, the perforation coefficient facing is taken equal to or more than 0.25; the thickness of the noise absorber lies in the optimal range of 20 ... 50 mm, and the lining is made of stainless steel, or a galvanized sheet with a thickness of 0.7 mm with a protective and decorative polymer coating of the Pural type with a thickness of 50 microns or Polyester with a thickness of 25 microns, or an aluminum sheet with a thickness of 1.0 mm and a coating thickness of 25 μm, and the cladding is made of structural materials with a layer of soft vibration-damping material, for example, VD-17 mastic or "Gerlen-D" type, applied on its surface from one or two sides, while the ratio between the thickness of the cladding and the vibration damping coating lies in the optimal range of 1: (2.5 ... 3.5), or slabs made of rockwool basalt-based mineral wool or URSA-type rockwool are used as sound-absorbing material. ", or basalt wool of type P-75, or glass wool with glass fiber lining, or soft foam polymer, such as polyethylene or polypropylene, and the sound-absorbing element over its entire surface is lined with an acoustically transparent material, such as fiberglass New type EZ-100 or polymer type "Poviden." As a sound-absorbing material of a sound absorber, plates based on aluminum-containing alloys are used, followed by filling them with titanium hydride or air with a density in the range of 0.5 ... 0.9 kg / m ³ with the following strength properties: compressive strength in the range of 5 ... 10 MPa, bending strength within 10 ... 20 MPa, or a sound absorber is made of a rigid porous sound-absorbing material, such as foam aluminum or cermets, or metal roll, or a shell rock with a degree of porosity in the range of op the maximum values of 30 ... 45%. An element in the form of layer-wise and cross-wound porous filaments wound around an acoustically transparent frame, such as a wire frame, is used as sound-absorbing material of a noise absorber. As a sound-absorbing material of a sound absorber, crumbs from solid vibration-damping materials, for example, elastomer, polyurethane or plastic compound such as Agate, Anti-Vibrate, Shvim, are used, and the size of the fractions of the crumb lies in the optimal range of values 0.3 ... 2.5 mm .

Figure 1 shows the air duct, General view; figure 2 is a section aa of figure 1; figure 3 is a section of the wall of the duct with acoustic cladding; figure 4, 5 - options for connecting air ducts.

An air duct with acoustic cladding consists of a set of sections 1, special inserts 2 for connecting direct channels and special inserts 3 for taps and branches. The dimensions of the sections and inserts are consistent with the catalog of lightweight structures. The walls of the sections and inserts are made of layered structures with inner 4 and outer 6 claddings made of hard materials, inside of which there is a sound absorber 5 made of sound-absorbing material. Moreover, the inner lining 4 can be made as continuous as well as perforated (not shown in the drawing), and the outer lining 6 can be made as continuous as well as perforated (not shown in the drawing). Sections and inserts are connected using locking devices 7 with sealing elements 8. In addition, the two walls of sections 1 and inserts 2 and 3 of the duct facing inside the premises can have a perforated outer lining 6 and are a sound-absorbing structure for absorbing noise indoors according to the type piece sound absorbers. The two opposite walls of the duct can also have a perforated inner lining 4 and are a continuous muffler of aerodynamic noise propagating inside the channel. The combination of performing one or another lining of the walls of the duct is determined by the necessary degree of sound absorption both in the duct and in the room and can be varied in any combination. The perforation coefficient of cladding is taken to be equal to or more than 0.25; the thickness of the noise absorber lies in the optimal range of 20 ... 50 mm, and the cladding is made of stainless steel, or a galvanized sheet with a thickness of 0.7 mm with a protective and decorative polymer coating of Pural type 50 μm thick or Polyester 25 μm thick, or an aluminum sheet with a thickness of 1.0 mm and a coating thickness of 25 μm. The lining is made of structural materials with a layer of soft vibration-damping material deposited on its surface on one or two sides, for example, VD-17 mastic or Gerlen-D type material, and the ratio between the thickness of the lining and vibration-damping coating lies in the optimal range of 1 : (2.5 ... 3.5).

Slabs made of rockwool basalt-based mineral wool or URSA-type mineral wool or P-75 basalt wool or glass wool lined with glass wool or soft foamed polymer, such as polyethylene or polypropylene, are used as sound absorbing material. moreover, the sound-absorbing element over its entire surface is lined with an acoustically transparent material, for example, fiberglass type EZ-100 or polymer type "Poviden."

As a sound-absorbing material of a sound absorber, plates based on aluminum-containing alloys can be used, followed by filling them with titanium hydride or air with a density in the range of 0.5 ... 0.9 kg / m ³ with the following strength properties: compressive strength in the range of 5 .. .10 MPa, bending strength within 10 ... 20 MPa. As a sound-absorbing material of a sound absorber, a rigid porous sound-absorbing material can be used, for example, foam aluminum, or cermets, or metal foam, or rock-shell with a degree of porosity in the range of optimal values of 30 ... 45%. As a sound-absorbing material of a sound absorber, an element can be used in the form of layer-wise and cross-wound from porous threads wound on an acoustically transparent frame, for example a wire frame. As a sound-absorbing material of a sound absorber, crumbs from solid vibration-damping materials, for example, elastomer, polyurethane or plastic compound such as Agate, Anti-Vibrate, Shvim, can be used, and the size of the fractions of the crumb lies in the optimal range of values 0.3 ... 2.5 mm

The duct with acoustic cladding works as follows.

The air duct absorbs noise well inside and indoors, and also reduces the structural noise propagating from the ventilation equipment along the walls of the channels, has a good appearance, manufacturability and efficiency of installation from the point of view of the interior and can serve as an integral part of the enclosing structures and the interior of industrial buildings lightweight constructions.

Claims (7)

1. The duct with acoustic cladding of the ventilation and air conditioning system of industrial premises, made of box sections connected by means of locking devices, the sections being made of lightweight sound-absorbing structures containing perforated internal and external claddings filled with sound absorbers from sound-absorbing materials, characterized in that the coefficient perforations of facings is taken to be equal to or more than 0.25; the thickness of the noise absorber lies in the optimal range of 20-50 mm, and the lining is made of stainless steel, or a galvanized sheet with a thickness of 0.7 mm with a protective and decorative polymer coating such as Pural 50 μm thick or Polyester 25 μm thick, or an aluminum sheet with a thickness of 1.0 mm and a coating thickness of 25 μm. 2. The duct with acoustic cladding according to claim 1, characterized in that the cladding is made of structural materials with a layer of soft vibration-damping material, for example, VD-17 mastic or “Gerlen-D” type material, applied on one or two sides thereof, the ratio between the thickness of the cladding and the vibration damping coating lies in the optimal range of 1: (2.5-3.5). 3. The duct with acoustic cladding according to claim 1, characterized in that the rockwool type mineral wool slabs are used as sound absorbing material of the sound absorber, and the sound absorbing element is lined with an acoustically transparent material over its entire surface, for example, EZ- fiberglass one hundred. 4. The duct with acoustic cladding according to claim 1, characterized in that as the sound-absorbing material of the noise absorber, plates based on aluminum-containing alloys are used, followed by filling them with titanium hydride or air with a density in the range of 0.5-0.9 kg / m ³ s the following strength properties: compressive strength in the range of 5-10 MPa, bending strength in the range of 10-20 MPa. 5. The duct with acoustic cladding according to claim 1, characterized in that the sound absorber is made of a rigid porous sound-absorbing material, for example foam aluminum, or cermets, or metal foam, or a shell rock with a degree of porosity in the range of optimal values: 30-45% . 6. The duct with acoustic cladding according to claim 1, characterized in that as the sound-absorbing material of the sound absorber, an element is used in the form of a layer-wise and cross-wound of porous threads wound on an acoustically transparent frame, for example a wire frame. 7. The duct with acoustic cladding according to claim 1, characterized in that the crumb of solid vibration damping materials, such as elastomer, polyurethane or plastic compound such as Agate, Anti-Vibrate, Shvim, is used as sound-absorbing material of the noise absorber, and the size of the fractions of crumbs lies in the optimal range of values: 0.3-2.5 mm.

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