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We are specialized for large fabrication of ventilation fan, axial and centrifugal. Besides, we can also weld other products according to drawings, pressure tank expecially.
Why Choose Us?
1. We have 12 years experience in large matal fabrication with low price and high quality.
2. All kinds of surface treatments are available: Polishing, Epoxy Coatings, zinc plating, nickel plating, powder coating, e-coating, DIP coating, phosphate coating, anodizing, painting, etc...
3. We can provide aluminum alloy castings, fabrications, deep drawing, machining, welding and assembly.
4. Roviding samples with important dimensions and customizing inspection report, material certification to customer for validation and verification
5. We specialize in fast turn around with low volume orders. Please forward your specification for quoting.
Material: carbon steel or according customer requirement.
Thickness: above 6mm or customized
Size: according to customer's requirement or drawing.
Surface treatment: shot blast, galvanization, oil, painting...
Matal cutting: laser cutting(<=20mm), plasma cutting
MOQ: 1pc
Production time: one-two weeks
Technology: rolling forged and welded
Package: steel pallet
I. Overview of fan silencer:
Fan silencer, fan silencer and drum induced fan silencer are used in the form of resistive sound-absorbing noise reduction principle which has good effect on medium and high frequency broadband characteristics, resistance sound-reducing principle which has good effect on low, medium frequency and pulsation characteristics, micro-perforated silencer and impedance composite silencer. Then fan silencer is also divided into: centrifugal fan silencer, Roots fan silencer, blower silencer, axial flow fan silencer and other categories of fan silencer. Resistive silencer is a kind of absorption silencer. According to the different structure of airflow channel, it is generally divided into straight tube type, chip type, folding plate type, honeycomb type, acoustic flow, labyrinth type and elbow type. Resistive silencer is the use of sound wave in the porous sound absorbing material transmission, by friction and viscous resistance, the sound energy into heat energy dissipation, so as to achieve the purpose of noise reduction. It is a kind of silencer widely used in all silencers.
Resistant silencer with impedance silencer noise elimination the noise reduction principle is different, it can't absorb sound energy directly, but the mutation on the use of pipeline interface or adjacent to a resonant cavity, make certain frequency of sound wave propagation along the pipeline, at the interface between mutations occur the phenomenon such as reflection, interference, so as to achieve the aim of dead drop sound, divided into expansion chamber silencer and resonant silencer.
In practical noise control projects, the noise is mainly in broadband band, so the resistive sound-absorbing and resistant sound-reducing structures are usually combined to control the high-intensity broadband noise.
Two, DS fan silencer classification and use:
1: centrifugal fan silencer:
Centrifugal fan silencer is mainly used in various series of high pressure centrifugal fans, used to reduce the air power noise, such as the inlet and outlet, its principle is developed according to the sound suppression principle, the silencer has excellent acoustic performance, good aerodynamic performance; Reasonable structure, easy to install, is a large air volume resistance cellular silencer, resistant section adopts multi-chamber resistant rubber straight pipe channel and cross-shaped sound absorption sheet form, so as to ensure sufficient noise attenuation in a wide range of frequency band.
2: Roots fan silencer:
Roots blower silencer is used to reduce the intake and exhaust noise of roots blower or blower. It can also be used for noise reduction of exhaust pipes and other high pressure fans. Roots fan silencer has simple structure, light weight, few consumables, beautiful appearance, convenient installation and fire prevention. Under the same flow rate of fan, this series silencer is also suitable for muffling inlet and exhaust of general high pressure fan.
3: application scope of fan silencer:
Fan is a general mechanical equipment, its use is very wide, electric power, mining, machinery, metallurgy, chemical and other industries are inseparable from the production of fan. The noise produced by the fan in operation often becomes the bane of affecting workers' health and disturbing the environment. In particular, the air power noise radiated by the air inlet and outlet of the fans in the adjacent living areas is the main factor of environmental pollution, which forms a public hazard. It is one of the main objects of noise pollution control in China's industrial departments in recent years.
Industrial fans are equipment for continuous operation. The international organization for standardization (ISO) to the noise of the standards set by such devices for 90 decibels or less, the new standard of the same in our country, this continuity and industry standards on the basis of noise, but without using noise elimination measures, the fan into the outlet to the environment by the noise of the shot up to 110 ~ 120 decibels, considerably more than the standard requirements.
Three, DS series ventilation and fan silencer structure principle:
According to the frequency spectrum characteristic data obtained from the actual testing of the noise sources in the field of various industrial fans, the amount of noise attenuation is determined as the main basis for the design of sound absorber and fluid channel, and a narrow rectangular channel with a large surface of sound absorbing material is adopted to enhance the absorption effect. In addition, when the noise source of the fan is at a large noise level, its frequency spectrum value is often more than one, and for different frequency bands, the noise reduction requirements are not the same.
For the DS series ventilation pipe silencer and drum induced draft fan silencer are sound impedance flow pattern, the sound-absorbing anechoic effect to the high and intermediate frequency noise resistance type structure and dead drop the sound effect to the medium and low frequency noise of the resistance type structure, USES in the resistance type channels at the same time the high frequency and low frequency of two kinds of sound-absorbing anechoic area, to a larger extent of band broadening sound; To achieve good noise reduction effect.
DS series ventilation duct silencer and drum induced draft fan silencer are suitable for all kinds of centrifugal, axial flow, Roots fans and air compressors.
When the user installs this product according to the requirement, its limit noise level will not exceed 85 ~ 90 db. If the fan silencer section and length is enough installation space, when the height is not enough width can change the section size, to expand the width, our company can supply according to the design requirements, the length of the fan silencer increase can improve the amount of noise, but the corresponding resistance loss also increases. The silencer introduced in this description is suitable for all kinds of centrifugal and axial flow fans. In addition, our factory also designs and produces various kinds of silencers for gas turbine, Roots fan, air compressor and diesel engine exhaust, welcome customers to inquire and purchase.
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