The muffler underground excavations

 

(57) Abstract:

The invention relates to mining and construction and can be used in the manufacture of mufflers underground workings. The objective of the invention is to provide a muffler that has a high efficiency of absorption in underground production at low weight and low production cost. The problem is solved due to the fact that the silencer contains placed along the mine wall cladding 2 and intermediate 3 panels and intermediate panels made of double-layer closed on the ends of the air gap. Each panel is assembled from highly porous blocks based on expanded clay gravel fraction 5-10 mm as aggregate and cement brand 400-500 as a binder in the ratio of 4:1. 2 Il.

The technical solution relates to mining and construction, namely, the noise absorbing device installed, for example, in ventilation mines to suppress or reduce noise to a level safe for humans, both underground and on the surface near the underground workings.

Known silencer for tunnel ventilation Metropolitan is of which contains a hollow elements with shell-shaped lens with a convex perforated surface, filled with noise absorbing material made of fiberglass and basalt fiber and Helmholtz resonators (see, for example, the patent of the Russian Federation 2137214, M. CL. G 10 K 11/00, F 01 F 8/00, publ.1999).

The disadvantages of this muffler is its structural complexity and high cost, and narrow scope, since it cannot be installed, for example, in the inlet ventilation system underground, working in the summer, because of the inevitable surge of malicious fiber particles from the muffler filled with passengers premises.

The closest solution to the proposed technical essence and the achieved result is a muffler for an underground mine, comprising placed along the mine wall cladding and the intermediate panel of sound-absorbing solid material and the cavities made in the facing panels, each intermediate panel along its entire length is made transverse through hole for the simultaneous absorption of sound waves at high and low frequencies (see, for example, USSR author's certificate 178934, M. CL. F 04 D 29/66, publ. 1966) prototype.

The main disadvantage of the above-described muffler-a prototype of yowie resonator waves are absorbed only in places messages through holes in the intermediate panels with through-hole resonators in facing panels. In addition, the muffler prototype has a large weight due to the high density monolithic panels, which is also the reason for the lack of effectiveness of suppression of low-frequency and high-frequency waves.

The objective of the proposed technical solution is the creation of such a muffler, which has a high efficiency of absorption in underground production at low weight and low production cost.

This objective is achieved in that the muffler underground tunnels containing resonators and placed along the mine wall cladding and the intermediate panel of sound-absorbing material, the intermediate panel is made of double-layer and consisting of a highly porous blocks based on expanded clay gravel fraction 5-10 mm as aggregate and cement grade 400 to 500 as a binder, while between the layers of each intermediate panel there is a gap closed free ends of the panels are semi-cylindrical blocks from the specified highly porous material.

The invention and its advantages will become more apparent from the following detailed example of its implementation with links to the present invention, installed in the ventilation Hodge underground mine;

Fig. 2 is a schematic view in perspective on a separate block of highly porous claydite-concrete.

As shown in Fig.1, the proposed muffler contains placed along the mine wall 1 facing 2 and intermediate 3 panels of absorbent material. In this case, this material is claydite-concrete. Cook it for use as aggregates of expanded clay gravel with a particle size of 5-10 mm, and as a binder used cement grade 400 or 500 in a volume ratio of 4:1. The density of the sample from the specified material is in the range 700-750 kg/m3. From this material made the blocks 4 in the form of a parallelepiped with dimensions HH, of which collected the intermediate panel 3, consisting of two layers, between which there is a gap 5 in the form of a slit over the entire area of the panel. Free ends of the panels 3 (in this case, the vertical front and rear ends of the panels) gap closed semi-cylindrical blocks 6 from the same highly porous claydite-concrete.

Does the silencer as follows.

Sound waves of high and low frequencies from a powerful ventilation set is. At the same time, getting in the zone of the intermediate panel 3, the sound wave smoothly changes the direction of propagation due to the presence of semi-cylindrical end blocks 6. The main part of the sound wave due to the presence of through-pores in the material of the claimed composition passes across and along the panels 2 and 3, is reflected from the walls of generation 1 and is held in a slit-like gaps 5 between the layers of the intermediate panel 3. Moreover, the high frequency component of the sound waves is absorbed mainly highly porous material panels, and medium - and low-frequency waves pass through the pores into the gaps 5 panels 3, dramatically reducing the velocity of propagation and, therefore, absorbed in these panels. Through pores in blocks of 4 in conjunction with a slit-like gaps 5 between the layers of the intermediate panels 3 are used in this case as resonators, absorbing sound waves of low frequency.

Thus, by performing the intermediate panels of highly porous blocks declared with special characteristics and the presence of a closed air space between the layers panel when working muffler is manifested unexpected technical effect is the absorption of sound at low and high frequencies of a single konstruktori essential features, listed in the formula of the present invention and disclosed in the example implementation of the last received muffler simple and easy design, with high efficiency of absorption due to the new technical effect consists in the simultaneous absorption of sound waves of different frequencies while passing through intermediate panel silencer.

The muffler underground workings, including resonators and placed along the mine wall cladding and the intermediate panel of sound-absorbing material, wherein the intermediate panel is made of double-layer and consisting of a highly porous blocks based on expanded clay gravel fraction 5-10 mm as aggregate and cement brand 400-500 as a binder in the ratio of 4: 1, while between the layers of each intermediate panel there is a gap closed free ends of the panels are semi-cylindrical blocks from the specified highly porous material.

 

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Acoustic panel // 2059772
The invention relates to acoustics, in particular to broadband samohlasen, and can be used in all sectors of national economy under the maximum sound attenuation functions of production equipment by the method of absorption

The invention relates to the construction and can be used for acoustic noise reduction in industrial buildings, land, air and water vehicles

Acoustic panel // 2268966

FIELD: industrial acoustic engineering, particularly broadband sound-absorbing means used in all industries to reduce noise generated by processing equipment.

SUBSTANCE: acoustic panel comprises smooth and perforated walls and sound-absorbing material arranged between the walls. Profiled sound-absorbing material surfaces are located between smooth and perforated walls and are inclined one to another at an angle less than 180°. The profiled surfaces are composed of separate members spaced predetermined intervals one from another. The smooth wall has one continuous shaped layer of sound-absorbing material.

EFFECT: increased sound-absorbing efficiency due to increased sound-absorbing surface and reduced labor inputs for panel production and source material consumption.

4 dwg

FIELD: industrial acoustics, particularly wideband sound-absorbing structures to reduce noise caused by industrial equipment operation.

SUBSTANCE: cells are formed by solids of revolution from perforated wall side. Method for cell creation involves forming sound-absorbing material by tool having shape congruent with cell shape; creating basic cell surfaces and creating additional cell surfaces. Cell forming tool is punch mating in shape with cell shape and having vertical displacement drive. The tool also has conical rod, which cooperates with inner surface formed in the punch and having the same taper angle as conical rod. Punch wall is provided with cylindrical orifices for additional shaping members receiving. The shaping members are spring-loaded relatively the wall. Compression spring is also provided. The first end of compression spring abuts annular shoulder formed in orifice. The second spring end thereof cooperates with tab washer made at additional shaping member end. The shaping member consists of two parts, namely cylindrical part and part defined by body of revolution, connected with each other.

EFFECT: increased sound-absorbing efficiency due to increased acoustical absorption factor by sound-absorbing surface increase along with structure size conservation.

3 cl, 8 dwg

FIELD: industrial acoustics, particularly broadband noise reduction of industrial equipment.

SUBSTANCE: cylindrical acoustic absorbing member comprises rigid cage suspended to industrial building ceiling by cables. The cage is filled with sound-absorbing material covered with caprone netting. The cage comprises lower and upper round perforated lids tightly connected with each other by central rod axially aligned with horizontal lid projection centers. At least three cage side forming rods are located around lid perimeters so that the cage side may have cylindrical shape.

EFFECT: increased sound absorbing efficiency due to extended frequency range and improved performance.

2 cl, 1 dwg

FIELD: industrial acoustics, particularly broadband noise reduction of industrial equipment.

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EFFECT: increased sound absorbing efficiency due to extended frequency range and improved performance.

1 cl, 1 dwg

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EFFECT: increased efficiency.

1 cl

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