High-temperature-resistant lightweight composite acoustic shield and device and manufacturing method thereof

Abstract

The invention provides a high-temperature-resistant lightweight composite acoustic shield and a device and a manufacturing method thereof. The high-temperature-resistant lightweight composite acoustic enclosure comprises a supporting frame and a sound insulation plate, the supporting frame is formed by winding carbon fiber cloth outside a metal pipe, the sound insulation plate is installed in an inner frame of the supporting frame and comprises a sandwich plate and a sound absorption material layer located on one side of the sandwich plate, and the sandwich plate is a carbon fiber PMI foam sandwich plate; the carbon fiber PMI foam sandwich panel comprises a core material PMI layer and a carbon fiber panel, and the core material PMI layer of the carbon fiber PMI foam sandwich panel is attached to the sound absorption material layer. The weight of the high-temperature-resistant lightweight composite acoustic enclosure can be reduced, and meanwhile the sound insulation performance and the high-temperature-resistant performance of the high-temperature-resistant lightweight composite acoustic enclosure are improved.

Description

Technical Field

[0001] This invention relates to the field of noise control technology, and in particular to a high-temperature resistant lightweight composite material soundproof cover, its device, and its manufacturing method. Background Technology

[0002] High-power diesel generator sets, compressor sets, and other equipment used in shipbuilding, transportation, and industrial sectors generate wide-bandwidth, high-intensity structural vibrations and airborne noise, severely impacting the work efficiency and quality of life of employees. Therefore, soundproof enclosures are necessary.

[0003] Traditional soundproof enclosures mostly use steel or aluminum metal plates, damping materials, and sound-absorbing materials, which have the following shortcomings: 1) Heavy weight: Traditional soundproof enclosures use metal plates and high-density sound-absorbing materials based on the mass law, resulting in heavy weight; 2) Low sound insulation efficiency: Traditional soundproof enclosures use a combination of steel plates, damping, and sound-absorbing materials, which has limited attenuation effect on broadband noise; 3) Insufficient high-temperature resistance: Conventional sound-absorbing and damping materials have poor high-temperature resistance and cannot meet the requirements of high-temperature environments. Summary of the Invention The main objective of this invention is to provide a high-temperature resistant lightweight composite material soundproof cover, its device, and its manufacturing method, which aims to reduce its weight while improving its sound insulation and high-temperature resistance performance.

[0004] To achieve the above objectives, the present invention provides a high-temperature resistant lightweight composite material soundproof cover, including a support frame and a soundproof panel. The support frame is formed by winding carbon fiber cloth around a metal tube. The soundproof panel is installed in the inner frame of the support frame. The soundproof panel includes a sandwich panel and a sound-absorbing material layer located on one side of the sandwich panel. The sandwich panel is a carbon fiber PMI foam sandwich panel, which includes a core PMI layer and a carbon fiber faceplate. The core PMI layer and the sound-absorbing material layer of the carbon fiber PMI foam sandwich panel are bonded together.

[0005] Preferably, a detachable soundproof door is installed in the inner frame of the support frame. The soundproof door has through holes for pipes to pass through. The material and structure of the soundproof door are the same as those of the soundproof panel. The soundproof door can be opened and closed relative to the support frame.

[0006] Preferably, the sound insulation panel and the sound insulation door are detachably connected to the support frame, and the gaps between the sound insulation panel and the sound insulation door and the support frame are filled with sealing strips.

[0007] Preferably, the high-temperature resistant lightweight composite material soundproof cover further includes a silencer installed on the soundproof panel.

[0008] Preferably, the thickness of the sandwich panel is not less than 10 mm.

[0009] Preferably, the thickness of the sound-absorbing material layer is not less than 20 mm; the sound-absorbing material layer is made of polyimide or PMI foam.

[0010] Preferably, the sound-absorbing material layer has mounting holes, and a local resonant sound-absorbing unit is fixed in the mounting holes. The local resonant sound-absorbing unit is an acoustic metamaterial filled in the mounting holes.

[0011] Preferably, the sandwich panel is bonded to the sound-absorbing material layer, and the local resonant sound-absorbing unit is bonded to the sound-absorbing material layer.

[0012] The present invention also proposes a high-temperature resistant lightweight composite material sound insulation device, including the above-mentioned high-temperature resistant lightweight composite material sound insulation cover, and further including a pipe segment passing through the sound insulation plate of the high-temperature resistant lightweight composite material sound insulation cover. The pipe segment is bonded to the sound insulation plate, and a sealing strip is filled in the gap between the pipe segment and the sound insulation plate. Both ends of the pipe segment are connected to flexible vibration damping pipes for connection to external pipelines.

[0013] The present invention further proposes a method for manufacturing a soundproof cover based on the above-mentioned high-temperature resistant lightweight composite material, comprising the following steps: The dimensions of the support frame are determined according to the design dimensions of the soundproof enclosure. The support frame is made of metal tubes and carbon fiber cloth is wrapped around the outside of the metal tubes. Each sound insulation panel and soundproof door is manufactured according to the shape of the supporting frame. The sandwich panel of the sound insulation panel and the sound-absorbing material layer are bonded together. The sound insulation panels and soundproof doors are installed in the inner frame of the support frame, and silencers are installed on the sound insulation panels.

[0014] The high-temperature resistant, lightweight composite material soundproof cover proposed in this invention has the following beneficial effects: 1. By using sandwich panels and a layer of sound-absorbing material on one side of the sandwich panels to make the sound insulation board, the weight of this sound insulation cover can be greatly reduced, which is more than 30% lighter than traditional metal. 2. This sound insulation board adopts a multi-layer sound insulation structure of sandwich panel and sound-absorbing material layer. The sound-absorbing material layer uses PMI foam and polyimide and other sound-absorbing materials to attenuate broadband noise, and uses Helmholtz resonant cavity or spatial winding and other sound-absorbing material layers to control individual strong line spectrum, so as to achieve full-band noise suppression. 3. The sound insulation panel with this structure can greatly improve the sound insulation and fire resistance of the sound insulation enclosure, with an average sound insulation of ≥20dB(A) (20Hz~20kHz) and a high temperature resistance of 180~240℃; 4. This high-temperature resistant lightweight composite material soundproof cover has the advantages of simple structure, easy manufacturing, and stable and reliable operation. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the structure of the high-temperature resistant lightweight composite material sound insulation cover of the present invention; Figure 2 This is a schematic diagram of the sound insulation panel in the high-temperature resistant lightweight composite material sound insulation cover of the present invention; Figure 3 The sound insulation was measured in a sound tube using 20mm thick PMI material. Figure 4 The sound absorption coefficient of 21mm thick polyimide; Figure 5 The calculated value is the sound insulation effect after applying this soundproof enclosure.

[0016] In the diagram, 1-support frame, 2-sound insulation board, 21-sandwich panel, 211-carbon fiber panel, 212-core material PMI layer, 22-sound absorbing material layer, 23-local resonant sound absorbing unit, 24-sealing strip, 3-soundproof door, 4-silencer.

[0017] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0018] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0019] It should be noted that in the description of this invention, the terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] This invention proposes a high-temperature resistant, lightweight composite material soundproof cover.

[0021] Reference Figure 1 and Figure 2In this preferred embodiment, a high-temperature resistant lightweight composite material soundproof cover includes a support frame 1 and a soundproof panel 2. The support frame 1 is formed by winding carbon fiber cloth around a metal tube. The soundproof panel 2 is installed in the inner frame of the support frame 1. The soundproof panel 2 includes a sandwich panel 21 and a sound-absorbing material layer 22 located on one side of the sandwich panel 21. The sandwich panel 21 is a carbon fiber PMI (polymethyl methacrylate) foam sandwich panel 21. The carbon fiber PMI foam sandwich panel 21 includes a core material PMI layer 212 and a carbon fiber panel 211. The core material PMI layer 212 of the carbon fiber PMI foam sandwich panel 21 is attached to the sound-absorbing material layer 22 (the two can be connected by adhesive).

[0022] The carbon fiber cloth is inherently adhesive, thus bonding to the outside of the metal tube. The metal tube is a hollow square tube. The sound-absorbing material layer 22 can be polyimide or PMI foam. The dimensions of the square tube are determined according to the load-bearing and strength requirements of the soundproof enclosure. The overall structure of the supporting frame 1 is a regular rectangular structure.

[0023] The dimensions of the support frame 1 can be determined according to the size of the equipment; the sound insulation level is determined according to the noise reduction requirements: such as 28dB (250Hz) or 35dB (1000Hz); thermal insulation: after 2 hours of continuous external 300℃, the internal temperature rise is ≤15℃ / h. The PMI layer 212 of the core material has 100% closed-cell and isotropic PMI, with excellent mechanical properties. The sandwich panel 21 has high specific stiffness, high temperature resistance, and high specific strength, and maintains stability in an environment of 180~240℃. It can reduce weight by more than 30% compared with traditional materials.

[0024] Furthermore, a detachable soundproof door 3 is installed in the inner frame of the support frame 1. The soundproof door 3 has through holes for pipes to pass through. The material and structure of the soundproof door 3 are the same as those of the soundproof panel 2. The soundproof door 3 can be opened and closed relative to the support frame 1. The soundproof door 3 and the soundproof panel 2 have the same structure, the difference being that the soundproof door 3 can be opened and closed relative to the support frame 1, while the soundproof panel 2 is fixedly installed relative to the support frame 1.

[0025] By setting up a soundproof door 3, when a user needs to pass through the soundproof enclosure to enter the other side, the soundproof door 3 can be opened, which makes it convenient for the user to maintain or repair the equipment on the other side of the soundproof enclosure.

[0026] In this embodiment, both the sound insulation panel 2 and the sound insulation door 3 are detachably connected to the supporting frame 1. This detachable connection ensures maintainability and a compact sound insulation device. The presence of holes or gaps negatively impacts the sound insulation effect of the sound insulation panel 2; the larger the area of ​​the hole or gap, the more severe the impact. Therefore, in this embodiment, sealing strips 24 are used to fill the gaps between the sound insulation panel 2, the sound insulation door 3, and the supporting frame 1. The use of sealing strips 24 ensures effective sound insulation.

[0027] Furthermore, referring to Figure 1 This high-temperature resistant lightweight composite material soundproof enclosure also includes a muffler 4 (which can be a resistive plate muffler) installed on the soundproof panel 2. For equipment with intake and exhaust ports, such as diesel generator sets, commonly used resistive plate mufflers are generally used to reduce intake noise. Equipment without intake and exhaust ports does not require a muffler 4.

[0028] Specifically, in this embodiment, the thickness of the sandwich panel 21 is not less than 10mm. The thickness of the sound-absorbing material layer 22 is not less than 20mm. The sound-absorbing material layer 22 is made of polyimide or PMI foam. The thickness of the PMI is selected based on the sound insulation performance and sound insulation requirements. When a 20mm thick PMI material is selected for the sound-absorbing material layer 22, the sound insulation amount of the sound-absorbing material layer 22 is measured in the sound tube, such as... Figure 3 As shown, when the sound-absorbing material layer 22 is 21mm thick, the sound absorption coefficient of the sound-absorbing material layer 22 is as follows: Figure 4 As shown.

[0029] Furthermore, mounting holes are provided on the sound-absorbing material layer 22, and local resonant sound-absorbing units 23 are fixed in the mounting holes. The local resonant sound-absorbing units 23 are acoustic metamaterials filled in the mounting holes (the acoustic metamaterials can be conventional materials of existing technology). The acoustic metamaterials can be made by encapsulating rubber material with a mass block (lead) and embedding it in an epoxy resin matrix.

[0030] A localized resonant sound-absorbing unit 23 is used to control individual strong line spectra. The frequency of the localized resonant unit is designed based on the equipment's strong line spectrum, thereby further improving the sound insulation effect of the soundproof enclosure. The calculated sound insulation effect of the soundproof enclosure after using the localized resonant sound-absorbing unit 23 is as follows: Figure 5 As shown.

[0031] In this embodiment, the sandwich panel 21 is bonded to the sound-absorbing material layer 22, and the localized resonant sound-absorbing unit 23 is bonded to the sound-absorbing material layer 22. This bonding connection simplifies the manufacturing process of the soundproof enclosure.

[0032] The high-temperature resistant, lightweight composite material soundproof cover proposed in this invention has the following beneficial effects: 1. By using sandwich panel 21 and a sound-absorbing material layer 22 located on one side of sandwich panel 21 to make sound insulation board 2, the weight of this sound insulation cover can be greatly reduced, which is more than 30% lighter than traditional metal. 2. This sound insulation board 2 adopts a multi-layer sound insulation structure of sandwich panel 21 and sound-absorbing material layer 22. The sound-absorbing material layer 22 uses sound-absorbing materials such as PMI foam and polyimide to attenuate broadband noise, and uses Helmhertz resonant cavity or spatial winding sound-absorbing material layer 22 to control individual strong line spectrum, so as to achieve full-band noise suppression. 3. The sound insulation panel 2 with this structure can greatly improve the sound insulation and fire resistance of the sound insulation enclosure, with an average sound insulation of ≥20dB(A) (20Hz~20kHz) and a high temperature resistance of 180~240℃; 4. This high-temperature resistant lightweight composite material soundproof cover has the advantages of simple structure, easy manufacturing, and stable and reliable operation.

[0033] The present invention also proposes a high-temperature resistant, lightweight composite material sound insulation device.

[0034] In this preferred embodiment, refer to Figure 1 A high-temperature resistant lightweight composite material sound insulation device includes a high-temperature resistant lightweight composite material sound insulation cover and a steel pipe (with through holes in the sound insulation plate 2 for the steel pipe to pass through) that passes through the sound insulation plate 2 of the high-temperature resistant lightweight composite material sound insulation cover. The steel pipe is bonded to the sound insulation plate 2, and a sealing strip 24 is filled in the gap between the steel pipe and the sound insulation plate 2. Flexible connecting pipes are connected to both ends of the steel pipe to connect to corresponding pipelines. The specific structure and beneficial effects of the high-temperature resistant lightweight composite material sound insulation cover are as described in the above embodiments and will not be repeated here.

[0035] Oil, steam, water, and electricity pipelines leading to the equipment need to pass through the soundproof enclosure, so holes need to be made in the soundproof enclosure. When the oil, steam, water, and electricity pipelines pass through the soundproof enclosure, first glue a section of steel pipe (with flanges at both ends) to the soundproof door 3 in the middle, and then connect the flexible vibration damping pipes to the two ends and then connect the corresponding pipelines.

[0036] The present invention further proposes a method for manufacturing a high-temperature resistant, lightweight composite material soundproof cover.

[0037] In this preferred embodiment, a method for manufacturing the above-mentioned high-temperature resistant lightweight composite material soundproof cover includes the following steps: Step S10: Determine the size of the support frame 1 according to the design dimensions of the soundproof enclosure, make the support frame 1 using metal tubes, and wrap carbon fiber cloth around the outside of the metal tubes. Step S20: According to the shape of the support frame 1, each sound insulation panel 2 and sound insulation door 3 are made. The sandwich panel 21 of the sound insulation panel 2 and the sound insulation door 3 are connected to the sound absorption material layer 22 by adhesive bonding. Step S30: Install the sound insulation panel 2 and the sound insulation door 3 into the inner frame of the support frame 1, and install the silencer 4 on one of the sound insulation panels 2.

[0038] The manufacturing method proposed in this invention is simple and easy to operate, and can greatly improve manufacturing efficiency.

[0039] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A high-temperature-resistant lightweight composite sound shield, characterized by, The sound insulation cover comprises a support frame and a sound insulation board, wherein the support frame is formed by winding carbon fiber cloth outside a metal pipe, the sound insulation board is installed in the inner frame of the support frame, the sound insulation board comprises a sandwich board and a sound-absorbing material layer on one side of the sandwich board, the sandwich board is a carbon fiber PMI foam sandwich board, the carbon fiber PMI foam sandwich board comprises a core material PMI layer and a carbon fiber panel, and the core material PMI layer of the carbon fiber PMI foam sandwich board is arranged in close contact with the sound-absorbing material layer.

2. The high-temperature resistant lightweight composite sound shield of claim 1, wherein, A detachable sound insulation door is installed in the inner frame of the support frame, a through hole is formed in the sound insulation door for the pipe to pass through, the material and structure of the sound insulation door are the same as those of the sound insulation board, and the sound insulation door is openable and closable relative to the support frame.

3. The high-temperature resistant lightweight composite sound shield of claim 2, wherein, The sound insulation board and the sound insulation door are detachably connected with the support frame, and a sealing strip is filled in the gap between the sound insulation board and the sound insulation door and the support frame.

4. The high-temperature resistant lightweight composite sound shield of claim 1, wherein, A sound absorber is further installed on the sound insulation board.

5. The high-temperature resistant lightweight composite sound shield of claim 1, wherein, The thickness of the sandwich board is not less than 10 mm.

6. The high-temperature resistant lightweight composite acoustic enclosure of claim 1, wherein, The thickness of the sound-absorbing material layer is not less than 20 mm, and the sound-absorbing material layer is made of polyimide or PMI foam.

7. The high-temperature-resistant, lightweight composite acoustic enclosure of any one of claims 1 to 6, wherein, Mounting holes are formed in the sound-absorbing material layer, and a local resonance sound-absorbing unit is fixed in the mounting holes, the local resonance sound-absorbing unit is an acoustic metamaterial filled in the mounting holes, and is used for absorbing specific prominent line spectrum noise.

8. The high-temperature resistant lightweight composite acoustic enclosure of claim 7, wherein, The sandwich board and the sound-absorbing material layer are adhesively connected, and the local resonance sound-absorbing unit and the sound-absorbing material layer are adhesively connected.

9. A high-temperature-resistant lightweight composite soundproofing device, characterized in that, The sound insulation cover further comprises a pipe segment installed on the sound insulation board of the high-temperature-resistant lightweight composite sound insulation cover, the pipe segment and the sound insulation board are adhesively connected, a sealing strip is filled in the gap between the pipe segment and the sound insulation board, and flexible damping pipes are connected to both ends of the pipe segment to connect with external pipelines.

10. A method for manufacturing a high-temperature-resistant lightweight composite sound shield according to claim 2, characterized in that, The method comprises the following steps: The size of the support frame is determined according to the design size of the sound insulation cover, the support frame is made of a metal pipe, and carbon fiber cloth is wound outside the metal pipe; The sound insulation board and the sound insulation door are made according to the shape of the support frame, and the sandwich board and the sound-absorbing material layer of the sound insulation board and the sound insulation door are adhesively connected; The sound insulation board and the sound insulation door are installed in the inner frame of the support frame, and a sound absorber is installed on the sound insulation board for equipment air intake and exhaust and noise control.

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