Buy Noise suppressors rectangular SMN
Noise suppressors rectangular SMN

Noise suppressors rectangular SMN

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Ukraine, Odessa
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14 years on Allbiz
Noise suppressors rectangular SMN
General information about noise
Low noise level during the work of systems of ventilation and air conditioning is very important indicator. Noise is one of the main sources of violation of comfortable state. Therefore by development of systems and selection of the corresponding equipment the acoustic factor shall be considered. Noise and sounds are created by the waves arising at compression and expansion in air, air ducts to system of hydraulics in the liquids moving on pipes. Speed of distribution of sound in air - about 340 m/s Key parameter of noise is its frequency. It corresponds to the number of fluctuations in second of waves of expansion and compression. Unit of frequency is the hertz. One hertz (1 Hz) is equal to one fluctuation a second. The person is capable to distinguish sounds ranging from 20 Hz to 20000 Hz. Under normal conditions works of systems of ventilation and air conditioning the narrow range of frequencies, as a rule, from 63 Hz to 8000 Hz is subject to consideration. The strip of frequencies is subdivided into eight standard groups of the waves called by "octava strips of frequencies" Each group is defined by average for it the frequency of waves: 63 Hz, 125 Hz, 250 Hz, 500 Hz, 1000 Hz, 2000 Hz, 4000 Hz, 8000 Hz. The division on octava strips of frequencies helps to provide sound range of noise with distribution of sound energy on different frequencies. For the correct control of noise level during the work of systems of ventilation and air conditioning it is important to consider the following fundamental rules: Availability of some noise is indoors inevitable The system of ventilation and conditioning can not indifferently is source of noise or to transfer him to other rooms with smaller noise level. For ensuring maximum efficiency at moderate expenses of measure for control of noise level it has to be provided at design stage of system. One of the most effective in the way of decrease in noise level in systems of ventilation and air conditioning is availability in system of noise suppressors which reduce the noise level created by units of ventilating system. Purpose of noise suppressors Noise suppressors are intended for decrease in noise level from fans in the channel of air duct, both on entrance, and at the exit.
Noise suppressors channel lamellar the SMN type are applied in systems of ventilation and air conditioning. Noise suppressors are established directly to the rectangular canal of systems of ventilation and air conditioning of industrial and public buildings in the conditions of temperate climate. The air moved via the channel or other inexplosive gas mixes, which aggression in relation to carbonaceous stalyam of ordinary quality aggressions of air, having temperature from minus 40 ° to +70 °C are not higher, should not contain sticky substances, fibrous and abrasive materials, and the content of dust and other solid impurity has to be no more than 100 mg/m 3. Speed of passing of air between plates of noise suppressor should not exceed 20 m/s. Channel lamellar noise suppressors like SMN can work in any situation.
In standard execution the body of noise suppressor is manufactured of galvanized steel sheet.
The main engineering characteristics of the applied noise-absorbing material are given further: Specific density: 80 kg/m 3 Durability on compression: 3 kN/m 2 (at deformation of 5%) Fire classification of plate: nonflammable Maximum working temperature: +55 °C Heat conductivity, W / mk, at different average temperatures: 10 °C - 0,034; 100 °C - 0,046; 200 °C - 0,065 Sizes and weight of noise suppressors
Noise suppressors are standardly made in nine standard sizes depending on the sizes of connecting flange. In cases of need production of noise suppressor with any necessary for the customer is possible geometrical sizes. The size of connecting flange (see) The size of connecting flange (see)
All noise suppressors like SMN pass tests in special laboratories where measurements of aerodynamic and acoustic parameters of noise suppressors are taken, namely loss of pressure of noise suppressors was defined at the test bench of special laboratory which includes flowmeter, the throttle device for regulation of consumption of air and the soothing camera with honeykomby and grids for alignment of air flow. Noise suppressors joined the output section of the camera. For motivation of the movement of air in system the channel fan of the corresponding type of the size was used. Aerodynamic characteristics of noise suppressors like SMN, namely dependences of loss of pressure on flow velocity of air in frontal section are given below. Working characteristics of noise suppressors Conditions of carrying out acoustic tests conformed to requirements of GOST (a) 23793-79 (Noise, methods of measurements of reduction of noise of the muffler of systems of ventilation, air conditioning and air heating). On the basis of results of measurements were defined efficiency of noise reduction by mufflers (in dB) in octava strips of frequencies. The obtained data are presented below in the form of tables and schedules of dependence of efficiency of noise reduction D L (noise reduction), from f frequencies
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Noise suppressors rectangular SMN
Noise suppressors rectangular SMN
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