RU22227U1 - MUFFLER MUFFLER - Google Patents

Abstract

A silencer in the round bend, containing a combination of active and reactive noise reduction elements, having a common prefabricated tight casing with end caps, an internal prefabricated perforated frame with end pipes, sound-absorbing material placed in the annular space between the frame and the casing, and a set of ring plates, characterized in that the perforations of the sections of the frame have different directions of diffraction, and the ring resonator plates are cut from the inside for different th circular arc length, are set perpendicular to the airflow and secured in the joints between the frame sections.

Description

mvMOF SHOCK DRIVER

Swaddled model refers to the equipment of ventilation systems, air otich-inc and air conditioning, and is designed to suppress aerodynamic slime in the air ducts of buildings and structures for various purposes.

Known silencer with a tap used in ventilation systems, consisting of a straight section and a tap, where the straight section and / or tap. at least partially, have a sound-absorbing coating 1 /

He-uKMaiKaMii imvoro silencer located in the connecting part of the duct - outlet, is its applicability only with the rectangular design of the Yao-duct. Significant narrowing of the bore at a low efficiency - a small thickness of the material. the use of a sound insulating coating only in the form of plates and only on curved planes of the passage liver, the low reliability of their fastening and the possibility of blowing it with an air stream, is absolutely unacceptable in the supply ventilation. Such a design allows to reduce the noise level. primarily . in the high frequency band and only partially AT low-frequency oscillations of sound waves

i The technical objective of the proposed utility model is to eliminate the shortcomings of rthrfjWHd-upotuiHua by significantly reducing the level of aerodynamic noise in the vvfi noiote spectrum of sound frequencies, quantitatively reducing the details of the air system, increasing reliability and efficiency The task should be solved in a device located in the duct outlet round or cross-sections, by using a combination of active and reactive elements of noise (acgnia. which allows you to effectively suppress sound waves in a wider the wide frequency spectrum of the passing air stream, also maintaining the required hygienic

Noise in the 90 ° branch of circular cross section is presented in longitudinal section at h ° rt 1; In Fig. 1, an annular resonator plate is selected in cross section

The silencer in the branch contains the active and reactive parts of the Active part (og g pit for a sealed common casing, assembled from intermediate 1 and extreme 2 (g-sections made of thin-sheet steel, side covers 3. Inner, assembled from sections made of thin-sheeted perforated arrow

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CL F 24G 13.24

; non-toxic material 5 and end pipes 6, which provide a nipple-flanged or retaining if necessary / connection with straight sections of nose 7 (duct). The internal perforated frame has holes of different directions with a diameter of 3 - 10 mm with a step of 5 - 20 mm and is covered with a substrate of a fabric that prevents blowing of sound-absorbing material by air flow.Light, highly effective and cheap sound-absorbing material 5, located in the annular space between the frame and the casing, is a mineral wagon. studied and molten rocks and silicate industrial wastes, having high instability and low hygroscopicity, unchanged volume and structure under the influence of their own weight, vibration and exposure to the air. The casing and frame sections, as well as end pipes and side covers are connected to the fold .but can also be connected to the lining by contact spot welding. (The main part of the silencer is provided by a set of ring resonator plates 7 made of sheet steel with a thickness of 0.35-1.0 mm inside with a diameter of 07 about g of the diammeter of the section of the frame, having radnapny incisions on the inside at different lengths of the circumference and fixed in the folded joints of the perforated frame sections. It is possible to install ring resonator cavities with external flanging by contact spot welding. For a straight-through section of the outlet, the resonator plates are frame-shaped with notches at different distances.

The silencer in the branch works as follows. During the passage of air, sound absorption occurs due to the conversion of sound energy into thermal energy as a result of air friction in a sound-absorbing material / active resistance /, most effective in a wide band often} with predominant attenuation of high-frequency sounds and weaker absorption of low-frequency sounds This is facilitated by the directional propagation sound waves through the perforation holes of the carcass sections, with the effect of refraction of sound waves and their multiple scattering in the beet-absorbing material . The air flow meets a set of notched transverse resonator plates 7 in the tap, which can oscillate differently depending on the distances between the notches when exposed to sound waves. When the eigenfrequencies and forced frequencies coincide, the resonator resistance becomes equal to zero, the amplitude of the air and air oscillations increases sharply, causing energy losses of the incident wave and increasing the value of the selective attenuation of low-frequency sounds with a discrete noise spectrum. The expansion of the sound attenuation spectrum is facilitated by

Rechator plates notched at different distances from each other. As a result of the combination of active and reactive action, the acoustic performance of the device improves, the number of duct parts is reduced. It is possible to use such silencers in the taps 60 ° n 45 °, respectively, with less efficiency FO noise reduction.

Thus, the task is successfully solved. The implementation of the technical solution is obvious. The practical use and manufacturability of the utility model is not in doubt.

Information source used in the description: 3. Document No. 4204189. class F 24 F 13/34. F 16 L 55/033, Germany. Oyubl. in RZh and SM 75 - 01 - 95. from . 9

Claims (1)

A silencer in the round bend, containing a combination of active and reactive noise reduction elements, having a common prefabricated tight casing with end caps, an internal prefabricated perforated frame with end pipes, sound-absorbing material placed in the annular space between the frame and the casing, and a set of ring plates, characterized in that the perforation holes of the frame sections have different directions of diffraction, and the ring resonator plates are cut from the inside for different th circular arc length, are set perpendicular to the airflow and secured in the joints between the frame sections.