CN215183052U

CN215183052U - Multilayer noise elimination structural layer disturbance silencer

Info

Publication number: CN215183052U
Application number: CN202022969169.1U
Authority: CN
Inventors: 张武军; 张超; 李卫庆
Original assignee: Zhenjiang East China Electric Power Equipment Co ltd
Current assignee: Zhenjiang East China Electric Power Equipment Co ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-12-14
Anticipated expiration: 2030-12-10

Abstract

The invention discloses a multilayer silencing structure layer disturbing silencer. The silencer comprises a silencer cylinder, an air inlet flow channel, an air outlet flow channel and a flow guide device, wherein the flow guide device, the air inlet flow channel and the air outlet flow channel are all positioned on the same central line, a plurality of silencing structure layers are further arranged in the silencer cylinder, air flow entering the silencer cylinder from the air inlet flow channel can flow along the flow guide device, sound waves in the air flow can be in contact with the innermost silencing structure layer for absorption, and then the air flow sequentially passes through the other silencing structure layers for sound absorption. After adopting above-mentioned structure, make sound wave and the most inboard noise elimination structural layer fully contact and absorb in the air current, and then loop through other noise elimination structural layer and carry out the sound absorption, further improved the sound absorption effect, further enlarged the frequency band of sound absorption, can effectual increase noise elimination effect, reduce the silencer volume, the equipment performance decline problem that the fibre ageing leads to can not appear in this structure in the course of the work also can avoid the medium to be polluted.

Description

Multilayer noise elimination structural layer disturbance silencer

Technical Field

The utility model relates to a silencer, specifically speaking are multilayer noise elimination structural layer disturbance silencer.

Background

With the rapid development of the industry and the construction industry, noise is inevitably generated in the use process of various devices, and the work and life of people are influenced by serious noise pollution. Especially in factories such as power plants and chemical plants, various devices generate a great deal of noise in production, the noise value is often over 85dB, and the work and life in the environment are harmful to the health of people.

Most of the existing mufflers on the market are resistive mufflers, impedance combined mufflers, orifice group mufflers and the like, each muffler has the characteristics and can be applied to specific application occasions, but certain limitations exist, for example, the resistive mufflers have good high-frequency absorptivity, but are easy to age to form powder, the performance of the mufflers is seriously reduced, media can be polluted, and the muffling performance of the impedance combined mufflers, the orifice group mufflers and the like is far inferior to that of the resistive mufflers.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide a multilayer noise elimination structural layer disturbance silencer that noise elimination performance is good not only for difficult ageing, pollution-free.

In order to solve the technical problem, the utility model discloses a multilayer noise elimination structural layer disturbance silencer, including the noise elimination section of thick bamboo, the air inlet flow channel that sets up two tip at the noise elimination section of thick bamboo with give vent to anger air current channel and install the guiding device in the noise elimination section of thick bamboo, guiding device and air inlet flow channel all are in on same central line with the air current channel of giving vent to anger, still be provided with in the noise elimination section of thick bamboo and be located a plurality of and the endocentric noise elimination structural layer of guiding device outlying, the air current that enters into the noise elimination section of thick bamboo from the air current that admits air current channel can flow along the guiding device and make in the air current sound wave and the most inboard noise elimination structural layer contact absorption, and then loop through other noise elimination structural layer and absorb sound.

The flow guide device comprises a central shaft positioned on the central line of the muffling cylinder and flow guide blades distributed on the periphery of the central shaft, wherein bearing seats are respectively installed at two ends of the central shaft through bearings, and the bearing seats are fixedly installed on inner end faces of two end parts of the muffling cylinder through supports.

The guide vanes are spirally and spirally arranged on the central shaft, and the included angle between the guide vanes and the axial direction of the central shaft is 20-45 degrees.

The silencing structure layer at least comprises a first silencing cover made of a perforated plate and a second silencing cover which is also made of a perforated plate and is positioned on the periphery of the first silencing cover.

The longitudinal section of the first layer of muffling cover is in a continuous trapezoidal shape or a corrugated shape, so that the outer contour of the first layer of muffling cover is in a spiral structure, and the second layer of muffling cover is in a cylindrical structure.

The first layer of muffling cover and the second layer of muffling cover form a cavity depth with a variable cross section, and relative acoustic impedance Z (r + j ω m) is jctg (ω D/C) according to a formula, so that different D values exist along the axis.

The thickness of the first layer of silencing cover and the thickness of the second layer of silencing cover are both 0.6mm-1.5mm, the hole diameter of each hole on the first layer of silencing cover and the hole on the second layer of silencing cover are both 0.2-0.8t, the perforation rate of the first layer of silencing cover is 2% -2.5%, and the perforation rate of the second layer of silencing cover is 1% -1.5%.

The shapes of the plate holes on the first layer of muffling cover and the second layer of muffling cover are circular, triangular and regular polygonal, and the plate holes are arranged in a regular quadrilateral or quincunx node form.

The silencing barrel comprises a barrel body and two end plates which are connected to two end portions of the barrel body and provided with mounting holes, wherein one end plate is provided with an inlet connecting pipe serving as an air inlet flow channel at the mounting hole of the end plate, a drain pipe which is positioned beside the inlet connecting pipe is arranged on the end plate, and the other end plate is provided with an outlet connecting pipe serving as an air outlet flow channel at the mounting hole of the end plate.

The silencing cylinder is internally provided with a medium-free filler or a light sound absorption material medium filler.

The support is provided with more than three and is radially arranged on the circumference of the bearing seat.

After the structure is adopted, because the flow guide device and the plurality of silencing structure layers which are concentric with the flow guide device are arranged in the silencing cylinder, the airflow entering the silencing cylinder from the air inlet airflow channel can flow along the flow guide device and enables sound waves in the airflow to be contacted and absorbed with the innermost silencing structure layer, and then sound absorption is carried out sequentially through the other silencing structure layers, particularly, the longitudinal section of the first silencing cover is in a continuous ladder shape or a corrugated shape, so that the outer contour is in a spiral structure, the airflow spirally flows in the space between the flow guide device and the first silencing cover, the sound waves in the airflow are fully contacted and absorbed with the micropunch plate, meanwhile, the cavity depth with variable section is formed between the first silencing cover and the second silencing cover, so that different D values exist along the axial line, different relative acoustic impedances Z are obtained, a wider silencing frequency band is obtained, and another sound absorption structure is formed under the action of the second silencing cover, the sound absorption effect is further improved, moreover, the aperture ratio of the first layer of sound absorption cover is different from that of the second layer of sound absorption cover, so that the sound absorption frequency band is further enlarged, the sound absorption effect can be effectively improved and the volume of the sound absorber can be reduced through the arrangement, in addition, the structure can not contain mineral fibers or other artificial fibers, the problem of equipment performance reduction caused by fiber aging can not occur in the working process, the medium can be prevented from being polluted, and the sound absorption structure is ideal equipment for sound absorption and noise reduction in occasions (such as chemical engineering, scientific experiments and the like) with higher requirements on the cleanliness of the medium; for the places where the fiber medium is allowed to be in a proper amount, the cavity can be filled with light sound absorption materials (such as an air conditioner and a mine ventilation system) to improve the noise spectrum characteristics.

Drawings

Fig. 1 is a schematic structural view of the disturbing muffler with multiple muffling structure layers of the present invention;

FIG. 2 is a schematic perspective view of a first layer of the muffling cover of the present invention;

fig. 3 is a schematic view of the three-dimensional structure of the middle flow guiding device of the present invention.

Detailed Description

The disturbing muffler with multiple layers of muffling structure layers according to the present invention will be described in detail with reference to the accompanying drawings and the following detailed description.

As shown in the figure, the utility model discloses a multilayer noise elimination structural layer disturbance silencer, include by two noise elimination section of thick bamboo 4 that have the end plate 3 constitution of mounting hole of circular shape barrel and welded connection at two tip of barrel, promptly: the two end plates 3 are all circular, the center of one end plate 3 is provided with a hole matched with the outlet connecting pipe, the center of the other end plate 3 is provided with a hole matched with the outlet connecting pipe, the mounting hole of one end plate is provided with an inlet connecting pipe 2 as an air inlet channel, the end plate where the air inlet channel is positioned is provided with a drain pipe 15 positioned beside the inlet connecting pipe, the drain pipe is a 1-inch stainless steel pipe, the mounting hole of the other end plate is provided with an outlet connecting pipe as an air outlet channel, the inlet connecting pipe 2 and the outlet connecting pipe are both steel pipes, the inlet connecting pipe 2 and the outlet connecting pipe are respectively provided with a connecting flange 1, the connecting flange 1 is a convex flange, the muffling cylinder 4 is connected with a pipeline through the connecting flange, of course, for the connecting structure, the connecting flange is a convex flange, and the use condition of the muffler can not be limited to flange connection, for example: the muffler comprises a muffler cylinder 4, a muffler shell, a muffler cover, a flow guide device 9, a fan and a fan, wherein the muffler cover is arranged on the muffler cover, the flow guide device comprises a central shaft 11 positioned on the central line of the muffler cover and flow guide blades 14 distributed on the periphery of the central shaft, the flow guide blades are made of stainless steel plates, and the thickness of the flow guide blades is generally 0.6mm-1.5 mm; it can be seen from the figure that the guide vanes 14 are spirally and spirally arranged on the central shaft 11, the included angle between the guide vanes 14 and the axial direction of the central shaft 11 is 20-45 degrees, the included angle is closely related to the performance of the silencer, the two ends of the central shaft 11 are respectively provided with the bearing seats 12 through the bearings 13, the bearing seats 12 are fixedly arranged on the inner end surfaces of the two end parts of the silencing barrel through the supports 10, specifically, the supports 10 are more than three and radially arranged on the circumference of the bearing seats, as can be seen from the figure, one end of each support is fixed on the bearing seat, the other end of each support is fixed on the end plate 3, the thickness of each support 10 is generally 2-4 mm (increased along with the requirements of size and strength), the support and the vibration damping function are performed on the central shaft 11, so that the support stability is improved, the central shaft 11, the air inlet flow channel and the air outlet flow channel of the guide device 9 are all positioned on the same central (axial) line, the silencing cylinder 4 is also internally provided with a plurality of silencing structure layers which are positioned on the periphery of the flow guide device and are concentric with the flow guide device, and the air flow entering the silencing cylinder 4 from the air inlet air flow channel can flow along the flow guide device and enables sound waves in the air flow to be contacted and absorbed with the innermost silencing structure layer, so that the sound absorption is carried out sequentially through the other silencing structure layers.

Furthermore, the sound-deadening structure layer at least comprises a first layer of sound-deadening hood 6 made of a perforated plate and a second layer of sound-deadening hood 5 made of a perforated plate and positioned at the periphery of the first layer of sound-deadening hood 6, in the embodiment, only the first layer of sound-deadening hood 6 and the second layer of sound-deadening hood 5 are arranged in the sound-deadening cylinder 4, a second cavity 7 is reserved between the second layer of sound-deadening hood 5 and the sound-deadening cylinder 4, a first cavity 8 is reserved between the first layer of sound-deadening hood 6 and the second layer of sound-deadening hood 5, a gap is reserved between the first layer of sound-deadening hood 6 and the guide vane, the distance between the first cavity 8 is 30mm-60mm, the distance between the second cavity 7 is 50mm, no sound-absorbing material is filled in the cavity, the thicknesses of the first layer of sound-deadening hood 6 and the second layer of sound-deadening hood 5 are both 0.6mm-1.5mm, the hole diameters of the hole holes on the first layer of sound-deadening hood 6 and the second layer of sound-deadening hood 5 are both 0.2-0.8t, the perforation rate of the first layer of the muffling cover 6 is 2% -2.5%, the perforation rate of the second layer of the muffling cover 5 is 1% -1.5%, as can be seen from the figure, the longitudinal section of the first layer of the muffling cover 6 is in a continuous trapezoid shape or a corrugated shape, so that the outer contour is in a spiral structure, the surface is provided with micro-pores, the second layer of the muffling cover 5 is in a cylindrical structure, the surface is provided with micro-pores, the cavity depth of a variable section is formed between the first layer of the muffling cover 6 and the second layer of the muffling cover 5, and different values of D exist along the axis according to the formula, wherein the relative acoustic impedance Z is r + j ω m is jctg (ω D/C).

In addition, the shape and the arrangement form of the holes of the silencer microporous plate are closely related to the performance of the silencer, and the shapes of the holes of the first layer of silencing cover 6 and the second layer of silencing cover 5 comprise circles, triangles and other regular polygons and are arranged in the form of regular quadrangle or quincunx nodes.

Still further, the first cavity and the second cavity of the muffler barrel 4 can be filled with medium-free fillers or light sound-absorbing material media (superfine fiber cotton with the density less than 100kg/m 3) fillers, so that the muffler is suitable for different working conditions of the muffler.

When in use, two or more double-layer microperforated panel mufflers can be combined into various incompletely identical combined mufflers in a series connection, parallel connection or series-parallel connection combination mode, wherein the inlet and outlet structure of a single muffler and the inlet and outlet diameter of the combined muffler can be different, and the connecting reducer pipe of the single muffler and equipment or a pipeline can be in the forms of a reducing pipe, a reducing flange and the like.

The utility model discloses hungry theory of operation as follows:

the airflow entering the silencer can fully enter the first layer of silencing cover 6 and the second layer of silencing cover 5 through the flow guide device arranged on the central (axial) line of the silencing cylinder and the spiral first layer of silencing cover 6, the airflow spirally flows in the space between the flow guide device and the first layer of silencing cover 6, the sound wave in the airflow is fully contacted and absorbed with the micropunch plate, the cavity depth with variable cross section is arranged between the first layer of silencing cover 6 and the second layer of silencing cover 5 when viewed from the cross section of the silencer, the relative acoustic impedance Z + j omega m is jctg (omega D/c) according to the formula, wherein D is the cavity depth, different D values exist in the axial line through the structure, so that different relative acoustic impedances Z are obtained, a wider silencing frequency band is obtained, and meanwhile, another microperforated structure is formed through the second layer of silencing cover 5 and the cavity between the silencing cylinder, the second layer muffling cover 5 has a different opening ratio from the first layer muffling cover 6, thereby further enlarging the frequency band of sound absorption.

Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and the changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also belong to the protection scope of the present invention.

Claims

1. The utility model provides a multilayer noise elimination structural layer disturbance silencer which characterized in that: including noise elimination section of thick bamboo (4), set up the air current passageway that admits air and the air current passageway of giving vent to anger of two tip of noise elimination section of thick bamboo and install guiding device (9) in the noise elimination section of thick bamboo, guiding device (9) and the air current passageway that admits air and the air current passageway of giving vent to anger all are in same central line, still be provided with in noise elimination section of thick bamboo (4) and be located a plurality of and the endocentric noise elimination structural layer of guiding device outlying, the air current that enters into noise elimination section of thick bamboo (4) from admitting air current passageway can flow along guiding device and make in the air current sound wave and the most inboard noise elimination structural layer contact absorption, and then loops through other noise elimination structural layer and absorb sound.

2. The multilayer sound-damping structure layer disturbing muffler of claim 1, wherein: the flow guide device comprises a central shaft (11) positioned on the central line of the muffling cylinder and flow guide blades (14) distributed on the periphery of the central shaft, wherein bearing seats (12) are respectively installed at two ends of the central shaft (11) through bearings (13), and the bearing seats (12) are fixedly installed on inner end faces of two end parts of the muffling cylinder through supports (10).

3. The multilayer sound-damping structure layer disturbing muffler of claim 2, wherein: the guide vanes (14) are spirally and spirally arranged on the central shaft (11), and the included angle between the guide vanes (14) and the axial direction of the central shaft (11) is 20-45 degrees.

4. The multilayer sound-damping structure layer disturbing muffler as recited in claim 1, 2 or 3, wherein: the silencing structure layer at least comprises a first silencing cover (6) made of a perforated plate and a second silencing cover (5) which is also made of a perforated plate and is positioned on the periphery of the first silencing cover (6); the longitudinal section of the first layer of the silencing cover (6) is in a continuous trapezoidal shape or a corrugated shape, so that the outer contour is in a spiral structure, and the second layer of the silencing cover (5) is in a cylindrical structure.

5. The multilayer sound-damping structure layer disturbing muffler of claim 4, wherein: the thickness of the first layer of the muffling cover (6) and the thickness of the second layer of the muffling cover (5) are both 0.6-1.5 mm, the hole diameter of each hole on the first layer of the muffling cover (6) and the hole diameter of each hole on the second layer of the muffling cover (5) are both 0.2-0.8t, the perforation rate of the first layer of the muffling cover (6) is 2-2.5%, and the perforation rate of the second layer of the muffling cover (5) is 1-1.5%.

6. The multilayer sound-damping structure layer disturbing muffler of claim 5, wherein: the shapes of the plate holes on the first layer of muffling cover (6) and the second layer of muffling cover (5) are circular, triangular and regular polygonal, and are arranged according to the regular quadrilateral or quincunx node form.

7. The multilayer sound attenuating structure layer disturbing muffler of claim 1, 2, 3, 5 or 6, wherein: the silencing barrel (4) comprises a barrel body and two end plates (3) which are connected to two end portions of the barrel body and provided with mounting holes, wherein one end plate is provided with an inlet connecting pipe (2) at the mounting hole of the end plate and serves as an air inlet airflow channel, a drain pipe (15) which is located beside the inlet connecting pipe is arranged on the end plate, and the other end plate is provided with an outlet connecting pipe at the mounting hole of the end plate and serves as an air outlet airflow channel.

8. The multilayer sound-damping structure layer disturbing muffler of claim 7, wherein: the silencing cylinder (4) is internally provided with a medium-free filler or a light sound absorption material medium filler.

9. The multilayer sound-damping structure layer disturbing muffler according to claim 2 or 3, wherein: the support (10) is provided with more than three and is radially arranged on the circumference of the bearing seat.