Equilateral wedge composite muffler

Abstract

The invention discloses an equilateral wedge-shaped composite silencer, which includes a silencer shell, an arc-shaped air inlet silencer elbow, an equilateral wedge-shaped sound absorber, and an air outlet silencer structure. The silencer shell includes a supporting steel structure, a shell steel plate, an internal sound absorption structure, an external reinforcement rib, an external sound insulation decorative module, and a double inverted water ceiling on the top; the outer shell of the equilateral wedge-shaped sound absorber is a composite pinhole aluminum sound absorbing plate, the top is an arc shape, and the bottom is a rectangular steel plate slot frame, the steel plate slot frame is connected to the load-bearing steel structure by installing fasteners, and no sound absorbing material is arranged inside, the spacing between the bottoms of the equilateral wedge-shaped sound absorbers is consistent, the long side of the steel plate slot frame is consistent with the length of the two short sides and a spacing, and two adjacent equilateral wedge-shaped sound absorbers form a silencer unit with a square bottom; the air outlet silencer structure includes an I-shaped sound absorber, a cross-shaped sound absorber, a supporting bottom plate, and rainproof shutters.

Description

Technical Field

[0001] The invention relates to the technical field of noise control and muffler, in particular to an equilateral wedge-shaped composite muffler which can effectively eliminate the large air volume and high noise level of a large high-pressure centrifugal fan. Background Art

[0002] The noise level of high-pressure fans is high, and the noise spectrum is a broadband noise dominated by medium and low frequencies. Because low-frequency noise has strong penetration, poor directivity, and strong diffraction ability. In ventilation systems in various occasions, fans are usually the most basic noise source. As the power source of the smoke and wind system of industrial enterprises, fans play a very important role, but at the same time, fan noise is also a major component of industrial enterprise noise. The International Organization for Standardization promotes 85dB (A) as the hearing loss standard. my country stipulates that the noise of newly built industrial enterprises should be controlled below 85dB (A), and the allowed noise value of old industrial enterprises is 90dB (A), and gradually transition to 85dB (A). In fact, the noise value of many high-pressure centrifugal fans has reached about 120dB (A), far exceeding the relevant national standards.

[0003] The development of large high-pressure centrifugal fans. Due to the characteristics of high wind speed, large air volume and high sound level at the air outlet of large high-pressure centrifugal fans, the environment in a considerable range around them is affected. The development of ventilation products tends to have higher air volume and higher air pressure. At the same time, the aerodynamic noise radiated by the air outlet is also greater. Since the wind pressure of the high-pressure fan is already balanced, if the wind resistance is increased due to silencer, it will affect the use function of the entire high-pressure fan system. At present, due to the contradiction between the high air volume, high noise level and aerodynamic performance of the high-pressure fan, the air outlet silencer produced by the existing technology can only achieve a silencer of ≤35dB(A). Summary of the invention

[0004] In order to overcome the shortcomings of existing silencers that are difficult to meet the noise reduction requirements of large air volume and high noise level, the present invention provides an equilateral wedge-shaped composite silencer, which uses a variety of noise reduction composite measures to meet the noise reduction effect of full-frequency noise, so that sensitive points in and around industrial enterprises can obtain good noise reduction effects.

[0005] The technical solution adopted by the present invention to solve its technical problems is: an equilateral wedge-shaped composite silencer, which includes a silencer shell, an arc-shaped air inlet silencer elbow, an equilateral wedge-shaped sound absorber, and an air outlet silencer structure; the silencer shell includes a supporting steel structure, a shell steel plate, an internal sound absorption structure, an external reinforcement rib, an external sound insulation decorative module, and a double inverted water ceiling on the top; the outer shell of the equilateral wedge-shaped sound absorber is a composite pinhole aluminum sound absorbing board, the top is an arc shape, and the bottom is a rectangular steel plate slot frame, the steel plate slot frame is connected to the load-bearing steel structure through the installation fastener, and no sound absorbing material is arranged inside, the spacing between the bottoms of the equilateral wedge-shaped sound absorbers is consistent, the long side of the steel plate slot frame is consistent with the length of the two short sides and a spacing, and two adjacent equilateral wedge-shaped sound absorbers form a silencer unit with a square bottom; the air outlet silencer structure includes an I-shaped sound absorber, a cross-shaped sound absorber, a supporting bottom plate, and rainproof shutters. The front, arc and side of the equilateral wedge-shaped sound absorber are all covered with composite pinhole aluminum sound absorbing boards. The composite pinhole aluminum sound-absorbing board has a strong absorption capacity for low-frequency noise, and the porous sound-absorbing material has a strong absorption capacity for medium and high-frequency noise. By setting different sound-absorbing materials and structures, the full-frequency absorption of high-pressure centrifugal fan noise can be met.

[0006] The I-shaped sound absorber and the cross-shaped sound absorber are made of porous sound absorbing materials wrapped with weather-resistant plastic film, and a protective perforated plate is arranged on the surface. The cross-shaped sound absorber is embedded in the grooves of the I-shaped sound absorber, and the width of the air flow channel between the cross-shaped sound absorber and the I-shaped sound absorber is consistent. There is no visible direct air outlet channel between the grooves of the I-shaped sound absorber and the cross-shaped sound absorber. The wind noise needs to be reflected and refracted multiple times between the grooves and the cross-shaped sound absorber, which greatly increases the contact between the sound waves and the sound absorbing material, thereby improving the sound attenuation. Since the effective area of ​​the air outlet channel is larger than that of the conventional sound attenuation shutter, the wind speed between the channels is slower and the wind resistance is smaller.

[0007] The equilateral wedge-shaped sound absorbers are evenly distributed on the vertical plane of the incoming air flow. The arc shape of the equilateral wedge-shaped sound absorbers faces the incoming air direction. The equilateral wedge-shaped sound absorbers are arranged in multiple layers, and there is a gap between the equilateral wedge-shaped sound absorbers of each layer. A load-bearing steel structure is arranged, and the ratio of the height of the equilateral wedge-shaped sound absorbers to the gap between the equilateral wedge-shaped sound absorbers of each layer is 8:2.

[0008] The supporting base plate of the air outlet sound-absorbing structure is horizontally arranged at the bottom of the I-shaped sound-absorbing body and the cross-shaped sound-absorbing body, and the sound-absorbing structure is arranged at the lower part of the supporting base plate. The rainproof louvers are arranged below the edge of the double inverted water ceiling outside the I-shaped sound-absorbing body and the cross-shaped sound-absorbing body, and the interval between the rainproof louvers and the I-shaped sound-absorbing body and the cross-shaped sound-absorbing body is 1 / 2 of the equivalent air outlet length of the rainproof louvers. An air flow channel is left in the middle of the annular structure plate, which separates the impedance sound-absorbing structure and the sound-absorbing expansion chamber into two sound-absorbing units. The smaller air flow channel in the middle of the annular structure plate and the larger space of the sound-absorbing expansion chamber form a sound-absorbing expansion chamber effect, which can reduce the sound energy entering the air outlet sound-absorbing louvers. Conventionally, the air outlet sound-absorbing structure adopts horizontally arranged air outlet sound-absorbing louvers, and the angled sound-absorbing sheet formed in order to achieve effective sound-absorbing, the sound-absorbing louvers and the air outlet must have a certain margin above and below, and the length of the sound-absorbing louvers is subject to certain restrictions, and it is necessary to add a sound-absorbing louver support and installation component, resulting in insufficient effective air outlet area, and the manufacturing and installation cost is high. Setting rainproof shutters outside the air outlet silencer structure is beneficial to maintaining the integrity of the silencer appearance. At the same time, a vertical air outlet silencer structure can be used, and the air outlet silencer structure is directly installed on the upper and lower structures of the air outlet, making full use of the effective space of the air outlet, and the manufacturing and installation cost is also low.

[0009] The air inlet silencer structure includes an air inlet, an arc-shaped sound-absorbing guide plate, a damping sound insulation plate is laid on the steel plate at the bottom of the muffler shell, and the cavity between the arc-shaped sound-absorbing guide plate and the right angle at the bottom is filled with bulk sound-absorbing material. The distance between the bottom of the muffler and the ground is small, and it is difficult to set up an external sound insulation decorative module, resulting in a weak link in sound insulation. Laying a damping sound insulation plate at the bottom of the muffler can meet the sound insulation requirements and has low installation costs. If the appearance of the air inlet guide section of the muffler is set to an arc shape, it can meet the design requirements of reducing the air inlet resistance. If the appearance of the muffler is set to a right-angled square, the overall appearance is complete, which is conducive to the installation of an external sound insulation decorative module. The arc-shaped sound absorption guide plate is set at a right angle at the bottom of the guide section, and the cavity formed between the arc-shaped sound guide plate and the right angle is filled with porous sound-absorbing material, which is conducive to the absorption of low-frequency noise.

[0010] The external sound insulation decorative module is a uniformly-made external sound insulation decorative module consisting of a galvanized square tube inner frame, an external color steel plate folded plate frame, and a damping sound insulation felt and a sound absorbing plate arranged on the inner side of the color steel plate. The galvanized square tube inner frame of the external sound insulation decorative module is spot welded on the external reinforcement rib, and the gaps between the external sound insulation decorative modules are filled with weather-resistant structural adhesive. Since there is a cavity and sound absorbing material between the external sound insulation decorative module and the steel plate of the muffler shell, the sound insulation of the muffler shell can be effectively improved. Compared with increasing the sound insulation by increasing the thickness of the steel plate, the setting cost is effectively reduced, and the appearance forms a decorative effect similar to that of the aluminum-plastic plate, which is conducive to improving the landscape effect.

[0011] The beneficial effect of the present invention is that, by providing comprehensive technical measures such as arc-shaped air inlet silencer elbow, equilateral wedge-shaped sound absorber, and air outlet silencer structure, the equilateral wedge-shaped composite silencer can achieve insertion loss ≥ 50dB (A), meeting the noise emission standards of "Industrial Enterprise Design Hygiene Standard" GBZ 1-2010 and "Industrial Enterprise Factory Boundary Environmental Noise Emission Standard" GB12348-2008. At the same time, the effective areas of the air flow channels between the equilateral wedge-shaped sound absorbers and the air flow channels between the air outlet silencer louvers are consistent, which optimizes the aerodynamic structure of the silencer, reduces the resistance loss, and ensures the discharge of exhaust pipe gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0013] Figure 1 It is a side view of the structure of an equilateral wedge-shaped composite muffler.

[0014] Figure 2 It is the AA construction view.

[0015] Figure 3 It is a top view of the sound absorber.

[0016] Figure 4 This is the front view of the sound absorber.

[0017] In the figure, 1. silencer shell, 11. supporting steel structure, 12. steel plate, 13. sound absorbing structure, 14. sound insulation decorative module, 15. ceiling, 2. air inlet silencer structure, 21. air inlet, 22. arc-shaped sound absorbing guide plate, 23. damping sound insulation board, 24. bulk sound absorbing material, 3. equilateral wedge-shaped sound absorbing body, 31. composite pinhole aluminum sound absorbing board, 32. arc shape, 33. steel plate channel frame, 34. installation fastener, 35. load-bearing steel structure, 4. air outlet silencer structure, 41. I-shaped sound absorbing body, 42. cross-shaped sound absorbing body, 43. supporting bottom plate, 44. rainproof shutters, 45. porous sound absorbing material, 46. protective perforated plate, 47. air flow channel. DETAILED DESCRIPTION

[0018] exist Figure 1 , 2In the embodiments shown in Figures 3 and 4, an equilateral wedge-shaped composite silencer comprises a silencer housing (1), an air inlet silencer structure (2), an equilateral wedge-shaped sound absorber (3), and an air outlet silencer structure (4). The muffler shell (1) comprises a supporting steel structure (11), a shell steel plate (12), an internal sound absorption structure (13), external reinforcement ribs, an external sound insulation decorative module (14), and a double inverted water ceiling (15) on the top; the outer shell of the equilateral wedge-shaped sound absorber (3) is a composite pinhole aluminum sound absorption plate (31), the top is an arc shape (32), and the bottom is a rectangular steel plate slot frame (33); the steel plate slot frame (33) is connected to the load-bearing steel structure (35) through a mounting fastener (34), and no sound absorption material is arranged inside; the spacing between the bottoms of the equilateral wedge-shaped sound absorbers (3) is consistent, the long side of the steel plate slot frame (33) is consistent with the length of the two short sides and a spacing, and two adjacent equilateral wedge-shaped sound absorbers (3) form a muffler unit with a square bottom; the air outlet muffler structure (4) comprises an I-shaped sound absorber (41), a cross-shaped sound absorber (42), a supporting bottom plate (43), and rainproof shutters (44).

[0019] The I-shaped sound absorber (41) and the cross-shaped sound absorber (42) are made of a weather-resistant plastic film wrapped with a porous sound absorbing material (45), and a protective perforated plate (46) is provided on the surface; the cross-shaped sound absorber (42) is embedded in the grooves of the I-shaped sound absorber (41); and the width of the air flow channel (47) between the cross-shaped sound absorber (42) and the I-shaped sound absorber (41) is consistent.

[0020] The equilateral wedge-shaped sound absorbers (3) are evenly distributed on a vertical plane of the incoming air flow, the arc-shaped (32) equilateral wedge-shaped sound absorbers (3) face the incoming air direction, the equilateral wedge-shaped sound absorbers (3) are arranged in multiple layers, and intervals are left between the equilateral wedge-shaped sound absorbers (3) of each layer. A load-bearing steel structure (35) is arranged, and the ratio of the height of the equilateral wedge-shaped sound absorbers (3) to the intervals between the equilateral wedge-shaped sound absorbers (3) of each layer is 8:2.

[0021] The support base plate (43) of the air outlet sound-absorbing structure (4) is horizontally arranged at the bottom of the I-shaped sound-absorbing body (41) and the cross-shaped sound-absorbing body (42); the sound-absorbing structure (13) is arranged at the lower part of the support base plate (43); the rainproof louvers (44) are arranged below the edge of the double-inverted ceiling (16) outside the I-shaped sound-absorbing body (41) and the cross-shaped sound-absorbing body (42); and the interval between the rainproof louvers (44) and the I-shaped sound-absorbing body (41) and the cross-shaped sound-absorbing body (42) is 1 / 2 of the equivalent air outlet length of the rainproof louvers (44).

[0022] The air inlet and silencer structure (2) comprises an air inlet (21) and an arc-shaped sound-absorbing guide plate (22); a damping sound-isolating plate (23) is laid on the steel plate (12) at the bottom of the silencer housing (1); and a bulk sound-absorbing material (24) is filled in the cavity between the arc-shaped sound-absorbing guide plate (22) and the right angle of the bottom.

[0023] The external sound insulation decorative module (14) is a uniformly sized external sound insulation decorative module (14) made of a galvanized square tube inner frame, an external color steel plate folded plate frame, and a damping sound insulation felt and a sound absorbing plate arranged on the inner side of the color steel plate. The galvanized square tube inner frame of the external sound insulation decorative module (14) is spot welded on the external reinforcement rib, and the gaps between the sound insulation decorative modules (14) are filled with weather-resistant structural adhesive.

[0024] The above embodiments are only used to further illustrate an equilateral wedge-shaped composite silencer of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the technical solution of the present invention.

Claims

1. An equilateral wedge-shaped composite muffler, comprising a muffler shell, an air inlet muffler structure, an equilateral wedge-shaped sound absorber, and an air outlet muffler structure, characterized in that: The shell of the equilateral wedge-shaped sound absorber is a composite pinhole aluminum sound absorbing board, the top is an arc shape, no sound absorbing material is set inside, and the bottom is a rectangular steel plate slot frame. The equilateral wedge-shaped sound absorbers are arranged in multiple layers, and the spacing between the bottoms of multiple equilateral wedge-shaped sound absorbers in each layer is consistent. The long side of the steel plate slot frame is consistent with the length of the two short sides and a spacing. Two adjacent equilateral wedge-shaped sound absorbers form a sound-absorbing unit with a square bottom; the ratio of the height of the equilateral wedge-shaped sound absorber to the spacing of each layer of equilateral wedge-shaped sound absorbers is 8:2; the air outlet sound absorber The sound structure includes an I-shaped sound absorber, a cross-shaped sound absorber, a supporting bottom plate, and rainproof louvers. The cross-shaped sound absorber is embedded in the grooves of the I-shaped sound absorber. The width of the air flow channel between the cross-shaped sound absorber and the I-shaped sound absorber is consistent. There is no visible direct air outlet channel between the grooves of the I-shaped sound absorber and the cross-shaped sound absorber. The I-shaped sound absorber and the cross-shaped sound absorber use weather-resistant plastic film to wrap porous sound-absorbing materials, and a protective perforated plate is provided on the surface. The air inlet silencer structure includes an air inlet and an arc-shaped sound-absorbing guide plate.

2. The equilateral wedge-shaped composite muffler according to claim 1 is characterized in that: The muffler shell includes a supporting steel structure, a shell steel plate, an internal sound absorption structure, external reinforcement ribs, an external sound insulation decorative module, and a double inverted water ceiling on the top.

3. The equilateral wedge-shaped composite muffler according to claim 1 is characterized in that: The equilateral wedge-shaped sound absorbers are evenly distributed on the vertical plane of the incoming air flow. The arc shape of the equilateral wedge-shaped sound absorbers faces the incoming air direction, and the bottom is a rectangular steel plate trough frame. The steel plate trough frame is connected to the load-bearing steel structure through installation fasteners. There is a gap between each layer of equilateral wedge-shaped sound absorbers, and a load-bearing steel structure is set.

4. The equilateral wedge-shaped composite muffler according to claim 1 is characterized in that: The supporting base plate of the air outlet sound-absorbing structure is horizontally arranged at the bottom of the I-shaped sound-absorbing body and the cross-shaped sound-absorbing body, the sound-absorbing structure is arranged at the lower part of the supporting base plate, and the rainproof louvers are arranged below the edge of the double-inverted ceiling outside the I-shaped sound-absorbing body and the cross-shaped sound-absorbing body.

5. The equilateral wedge-shaped composite muffler according to claim 1 is characterized in that: A damping sound insulation board is laid on the steel plate at the bottom of the muffler shell, and a porous sound absorbing material is filled in the cavity between the arc-shaped sound absorbing guide plate and the right angle of the bottom.

6. The equilateral wedge-shaped composite muffler according to claim 2 is characterized in that: The external sound insulation decorative module is a sound insulation decorative module of uniform specifications made of a galvanized square tube inner frame, an external color steel plate folded plate frame, and damping sound insulation felt and sound absorbing panels arranged on the inner side of the color steel plate. The galvanized square tube inner frame of the external sound insulation decorative module is spot welded on the external reinforcement rib, and the gaps between the sound insulation decorative modules are filled with weather-resistant structural adhesive.

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