Multi-frequency selection noise reduction device

Abstract

The present invention discloses a multi-frequency selective noise reduction device, comprising: an inner layer noise reduction unit, which is arranged on the side close to the noise source, and is provided with: an inner layer substrate, which is a micro-perforated plate; an inner covering layer, which is bonded to the inner layer substrate; an inner sound absorbing layer, which is made of a porous sound absorbing material; and an inner sound insulation layer, which is a panel structure. A vacuum noise reduction unit, which is provided with a vacuum outer skeleton, and the vacuum outer skeleton is supported on the panel of the inner sound insulation layer through a first vibration reduction connector to form a closed vacuum layer; the vacuum noise reduction unit also includes a heat conductive connecting piece, and the heat conductive connecting piece runs through the inner layer noise reduction unit and the closed vacuum layer. The device of the present invention can effectively isolate complex industrial noises in different frequency bands of medium and high frequencies and medium and low frequencies, and at the same time solve the ventilation and heat dissipation problems of high-temperature equipment pipelines. The device has a simple structure and good versatility.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial noise control, and in particular relates to a multi-frequency selective noise reduction device. Background Art

[0002] Noise is a common hazard factor for occupational hearing loss, and long-term exposure to high noise can lead to noise-induced deafness. There are many types of dynamic equipment such as compressors and turbines on site in chemical enterprises, and they are centrally arranged with process pipelines, which form a roar in the working environment area. The noise has a wide frequency band and high intensity, and it shows a dynamic change trend with the adjustment of process parameters, which seriously affects the occupational health of workers. In the process of industrial noise hazard control, there are the following problems: 1) The noise spectrum characteristics on site in the chemical industry are very complex, some are steady-state, some are non-steady-state, some are mainly medium and high frequencies, and some are mainly medium and low frequencies. Conventional sound insulation equipment has a significant effect on medium and high frequency steady-state noise, but the control effect on medium and low frequency spectral characteristic noise is poor. Effective noise reduction measures cannot be taken for hazards with a wide frequency band of on-site noise; 2) Most dynamic equipment has high ventilation and heat dissipation requirements. The exhaust volume of the ventilation device in the sound insulation equipment is too large, which has low economic efficiency and low corporate acceptance, and is prone to forming local cooling dead corners, leading to process alarms; the exhaust volume of the ventilation device is too small, and it cannot meet the heat dissipation requirements in the hottest months of summer. Most companies open the doors and windows of the sound insulation equipment for maintenance, and the noise reduction function is greatly reduced.

[0003] In the prior art, for example, Chinese patent application CN109397795A discloses a multi-frequency selective sound-absorbing and noise-reducing structure and a preparation method. The sound-absorbing and noise-reducing structure includes a panel, a honeycomb structure, an elastic perforated diaphragm, a porous sound-absorbing material, a base plate, etc. The honeycomb structure is bonded between the panel and the base plate, and an elastic perforated diaphragm and a porous sound-absorbing material of a certain thickness are arranged in the honeycomb cavity. This solution applies an elastic perforated diaphragm to the honeycomb structure to avoid the problem of decreased mechanical properties in the preparation process of the traditional structure, and can also avoid blocking the small holes in the middle layer during the bonding process, which can effectively reduce weight and reduce processing difficulty and cost. And by utilizing the characteristic of the elastic diaphragm that can vibrate back and forth in the honeycomb cavity, the energy of low-frequency noise can be reduced. Filling with porous sound-absorbing materials can not only meet the mechanical properties of the structure, but also utilize the excellent high-frequency and broadband sound absorption characteristics of the porous sound-absorbing materials to improve the sound-absorbing performance of the overall structure.

[0004] The above-mentioned solutions in the prior art are not effective in treating both mid-high frequency and mid-low frequency noise, and do not take into account the heat dissipation requirements brought by the moving equipment. They are not effective in situations where there are a large number of moving equipment and both noise reduction and heat dissipation are required. Therefore, there is an urgent need for a multi-frequency selection noise reduction device that can meet the noise reduction requirements of mid-high frequency and mid-low frequency, while taking into account the heat dissipation requirements.

[0005] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0006] The purpose of the present invention is to provide a multi-frequency selective noise reduction device, which can effectively isolate complex industrial noise in different frequency bands of medium-high frequency and medium-low frequency, and at the same time solve the ventilation and heat dissipation problems of high-temperature equipment pipelines. The device has a simple structure and good versatility.

[0007] To achieve the above-mentioned object, according to the first aspect of the present invention, the present invention provides a multi-frequency selective noise reduction device, comprising: an inner layer noise reduction unit, which is arranged on the side close to the noise source, and is provided with: an inner layer substrate, which is a micro-perforated plate; an inner covering layer, which is bonded to the inner layer substrate; an inner sound absorbing layer, which is made of a porous sound absorbing material; and an inner sound insulation layer, which is a panel structure. A vacuum noise reduction unit, which is provided with a vacuum outer skeleton, which is supported on the panel of the inner sound insulation layer through a first vibration reduction connector to form a closed vacuum layer; the vacuum noise reduction unit also includes a heat conductive connecting piece, which runs through the inner layer noise reduction unit and the closed vacuum layer.

[0008] Furthermore, in the above technical solution, the heat-conducting connecting piece is made of porous silicon carbide or graphene. The pore size of the heat-conducting connecting piece can be 50nm-100um, the porosity is 25%-50%, and the thermal conductivity is 50-250W / m·k.

[0009] Furthermore, in the above technical solution, the thickness of the vacuum layer can be 15 to 30 mm; and the vacuum degree can be less than or equal to 0.5 atmospheres.

[0010] Furthermore, in the above technical solution, the first vibration-damping connecting member is evenly arranged in the vacuum layer, and the first vibration-damping connecting member can be a vibration-damping spring or a vibration-damping rubber.

[0011] Furthermore, in the above technical solution, the micro-perforated plate can be an aluminum plate or a galvanized steel plate, and the plate thickness of the micro-perforated plate can be 0.4 to 0.8 mm; the hole diameter is 1.5 to 4 mm; and the perforation rate is 8% to 18%.

[0012] Furthermore, in the above technical solution, the inner coating can be made of non-woven fabric, glass fiber cloth or glass fiber cloth; the thickness of the inner coating can be 0.2 mm, and the surface density can be 45 to 65 g / m 2 .

[0013] Furthermore, in the above technical solution, the porous sound-absorbing material can be rock wool, slag wool, ultra-fine glass wool, polyurethane or ethyl formate; the thickness of the porous sound-absorbing material is 25 to 50 mm, the sound absorption coefficient is greater than or equal to 0.6, and the bulk density of the sound-absorbing material is 24 to 80 KN / m 3 .

[0014] Furthermore, in the above technical solution, the panel of the inner sound insulation layer may be an aluminum-plastic plate with a thickness of 0.4 to 1.0 mm.

[0015] Furthermore, in the above technical solution, the noise reduction device as a whole can be designed as a soundproof wall structure or a soundproof room structure.

[0016] To achieve the above-mentioned purpose, according to the second aspect of the present invention, the present invention provides a multi-frequency selective noise reduction device, comprising: an inner layer noise reduction unit, which is arranged on the side close to the noise source, and is provided with: an inner layer substrate, which is a micro-perforated plate; an inner covering layer, which is bonded to the inner layer substrate; an inner sound absorbing layer, which is made of a porous sound absorbing material; and an inner sound insulation layer, which is a panel structure. A vacuum noise reduction unit, which is provided with a vacuum outer skeleton, and the vacuum outer skeleton is supported on the panel of the inner sound insulation layer through a first vibration-damping connecting piece to form a closed vacuum layer; the vacuum noise reduction unit also includes a heat-conducting connecting piece, and the heat-conducting connecting piece runs through the inner layer noise reduction unit and the closed vacuum layer. An outer layer noise reduction unit, which has the same layered structure as the inner layer noise reduction unit, has an air layer between the outer layer noise reduction unit and the vacuum outer skeleton, and second vibration-damping connecting pieces are evenly arranged in the air layer.

[0017] Furthermore, in the above technical solution, the thickness of the air layer can be 50 to 100 mm.

[0018] Furthermore, in the above technical solution, a temperature control device may be connected to the air layer. When the temperature control device detects that the temperature in the air layer is higher than a threshold value, a purge pipeline connected to the air layer is started to cool down the air layer.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1) The inner noise reduction unit can effectively block mid- and high-frequency noise; the vacuum layer of the vacuum noise reduction unit can prevent the propagation of sound in the full frequency band; and the heat-conducting connecting parts that run through the inner noise reduction unit and the sealed vacuum layer can not only effectively block mid-, low-, and high-frequency noise, but also help dissipate heat;

[0021] 2) The outer noise reduction unit serves as a noise reduction reinforcement layer. The air layer setting helps to hinder the propagation of sound and can further reduce mid- and high-frequency noise;

[0022] 3) The combined use of the noise reduction units of the present invention can reduce the equipment pipeline noise by 25 to 30 decibels;

[0023] 4) It has good sound insulation and noise reduction effects for all-band high-noise industrial environments such as low, medium and high frequencies;

[0024] 5) Fully consider the ventilation and heat dissipation of the equipment, meet the process requirements, and have high practicality;

[0025] 6) The device has a simple structure and good versatility, and is suitable for standardization and mass production.

[0026] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, and to make the above and other purposes, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of embodiment 1 of the multi-frequency selective noise reduction device of the present invention.

[0028] Figure 2 It is a structural schematic diagram of embodiment 2 of the multi-frequency selective noise reduction device of the present invention.

[0029] Description of main reference numerals:

[0030] 1-inner noise reduction unit, 11-inner substrate, 12-inner covering layer, 13-inner sound absorbing layer; 14-inner sound insulation layer;

[0031] 2-vacuum noise reduction unit, 21-first vibration reduction connection piece, 22-vacuum layer, 221-vacuum gauge, 222-vacuum valve, 23-heat conductive connection piece, 24-vacuum outer skeleton;

[0032] 3-outer noise reduction unit, 31-second vibration reduction connecting piece, 32-air layer, 321-thermometer, 33-outer substrate, 34-outer covering layer, 35-outer sound absorbing layer, 36-outer sound insulation layer. DETAILED DESCRIPTION

[0033] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0034] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0035] In this document, for the convenience of description, spatial relative terms such as "below", "below", "down", "above", "above", "upper", etc. may be used to describe the relationship between one element or feature and another element or feature in the accompanying drawings. It should be understood that the spatial relative terms are intended to include different orientations of the object in use or operation in addition to the orientation depicted in the figure. For example, if the object in the figure is turned over, the element described as being "below" or "below" other elements or features will be oriented "above" the element or feature. Therefore, the exemplary term "below" can include both below and above. Objects may also have other orientations (rotated 90 degrees or other orientations) and the spatial relative terms used in this document should be interpreted accordingly.

[0036] In this document, the terms "first", "second", etc. are used to distinguish two different elements or parts, and are not used to limit a specific position or relative relationship. In other words, in some embodiments, the terms "first", "second", etc. can also be interchangeable.

[0037] Example 1

[0038] like Figure 1 As shown, the multi-frequency selective noise reduction device of Example 1 of the present invention is composed of an inner noise reduction unit 1 and a vacuum noise reduction unit 2. The inner noise reduction unit 1 includes an inner substrate 11, an inner covering layer 12, an inner sound absorbing layer 13 and an inner sound insulation layer 14 from the inside to the outside (the inside is closer to the noise source). The outermost side of the vacuum noise reduction unit 2 is a vacuum outer skeleton 24, which is supported on the panel of the inner sound insulation layer 14 by a first vibration reduction connector 21 to form a closed vacuum layer 22. The vacuum noise reduction unit 2 also includes a heat conductive connector 23, which runs through the inner noise reduction unit 1 and the closed vacuum layer 22. A vacuum gauge 221 and a vacuum valve 222 are connected to the vacuum layer 22.

[0039] Specifically, the inner substrate 11 of the inner noise reduction unit 1 is made of a micro-perforated plate, which includes but is not limited to aluminum plates, galvanized steel plates and other metal perforated plates. The thickness of the micro-perforated plate is 0.4-0.8 mm, the aperture is 1.5-4 mm, the perforation rate is 8-18%, and the perforation pattern can be rectangular holes, square holes, diamond holes, round holes, oblong holes, hexagonal holes, cross holes, triangular holes, long waist holes, plum blossom holes, fish scale holes, pattern holes, eight-shaped nets, herringbone holes, five-pointed star holes, irregular holes, bulging holes, special-shaped holes, louver holes, etc. The inner covering layer 12 of the inner noise reduction unit 1 can be made of non-woven fabrics, glass fiber cloth or glass fiber cloth, etc. The inner covering layer 12 is pasted on the inner substrate 11. After pasting, its thickness is 0.2 mm and the surface density is 45-65 g / m 2The inner sound-absorbing layer 13 of the inner noise reduction unit 1 is made of porous sound-absorbing material, which can be rock wool, slag wool, ultra-fine glass wool, polyurethane, ethyl formate and its products, with a sound absorption coefficient of ≥0.6, and the sound-absorbing material accounts for no less than 30% of the panel area, with a thickness of 25-50 mm. Different materials have different optimal bulk density parameters (generally 24-80 KN / m 3 The inner sound insulation layer 14 of the inner noise reduction unit 1 is made of aluminum-plastic panel with a thickness of 0.4-1.0 mm. The combination of the above four-layer structure of the inner noise reduction unit 1 has a good sound absorption and vibration reduction effect as a whole, and has a good shielding effect for medium and high frequency noise of 1000 to 4000 Hz.

[0040] Furthermore, the vacuum noise reduction unit 2 has a plurality of first vibration-damping connectors 21, which are used as a skeleton to connect the inner noise reduction unit 1 and the vacuum outer skeleton 24, that is, the vacuum outer skeleton 24 is supported on the panel of the inner sound insulation layer 14 of the inner noise reduction unit 1 through the first vibration-damping connectors 21, forming a closed vacuum layer 22. The first vibration-damping connectors 21 are evenly distributed in the vacuum layer 22, and the layout methods include but are not limited to triangle, rectangle, honeycomb, plum blossom, chessboard, snake, radial, irregular, etc. The length of the first vibration-damping connector 21 is the same as the thickness of the vacuum layer 22, and the vibration-damping methods include but are not limited to spring vibration-damping, rubber vibration-damping or other damping element vibration-damping. The first vibration-damping connector 21 is installed by bonding, bolt connection or integral vulcanization molding. The thickness of the vacuum layer 22 is 15 to 30 mm, and a vacuum gauge 221 and a vacuum valve 222 are connected in the vacuum layer 22, and a vacuum pump is connected to the vacuum valve 222. The vacuum pump evacuates the vacuum layer 22 through the vacuum valve 222, so that the vacuum degree of the vacuum layer 22 is not greater than 0.5 atmospheres, wherein the vacuum valve 222 is used to control the switch pipeline of the vacuum layer 22. The vacuum gauge 221 can be an integrated digital vacuum gauge or a split digital vacuum gauge. The thermal conductive connector 23 is made of high thermal conductivity materials, including but not limited to porous silicon carbide, graphene and its products, with a pore size in the range of 50nm to 100um, a porosity of 25% to 50%, and a thermal conductivity range of 50 to 250W / m·k. Figure 1 As shown, the high thermal conductivity connecting piece made of the above materials runs through the inner noise reduction unit 1 and the sealed vacuum layer 22, which can not only have a good blocking effect on the full-band noise of medium, low and high frequencies, but also have a good heat dissipation effect, and is resistant to high temperature and acid and alkali corrosion.

[0041] The inner noise reduction unit 1 in Example 1 can effectively block mid- and high-frequency noise, the vacuum layer 22 of the vacuum noise reduction unit 2 can prevent the propagation of sound in the full frequency band, and the heat-conducting connecting piece 23 that runs through the inner noise reduction unit 1 and the sealed vacuum layer 22 can not only have a good blocking effect on mid-, low- and high-frequency noise, but also help dissipate heat.

[0042] Example 2

[0043] like Figure 2 As shown, the multi-frequency selective noise reduction device of Example 2 of the present invention is composed of an inner noise reduction unit 1, a vacuum noise reduction unit 2 and an outer noise reduction unit 3. The inner noise reduction unit 1 includes an inner substrate 11, an inner covering layer 12, an inner sound absorbing layer 13 and an inner sound insulation layer 14 from the inside to the outside (the inside is closer to the noise source). The outermost side of the vacuum noise reduction unit 2 is a vacuum outer skeleton 24, which is supported on the panel of the inner sound insulation layer 14 by a first vibration reduction connector 21 to form a closed vacuum layer 22. The vacuum noise reduction unit 2 also includes a heat conductive connecting piece 23, which runs through the inner noise reduction unit 1 and the closed vacuum layer 22. A vacuum gauge 221 and a vacuum valve 222 are connected to the vacuum layer 22. The material layered structure of the outer noise reduction unit 3 is basically the same as that of the inner noise reduction unit 1, that is, it includes an outer substrate 33, an outer covering layer 34, an outer sound absorbing layer 35 and an outer sound insulation layer 36 arranged in sequence from the inside to the outside. There is an air layer 32 between the material layered structure of the outer noise reduction unit 3 and the vacuum outer skeleton 24, and the second vibration damping connecting parts 31 are evenly arranged in the air layer 32.

[0044] Furthermore, the structures and materials of the inner layer noise reduction unit 1 and the vacuum noise reduction unit 2 in Example 2 are the same, and will not be described in detail here.

[0045] The second vibration-damping connector 31 of the outer layer noise reduction unit 3 in Example 2 can be provided in plurality, and is used as a skeleton to connect the vacuum outer skeleton 24 and the outer layer noise reduction unit 3, that is, the material layered structure of the outer layer noise reduction unit 3 is supported on the vacuum outer skeleton 24 through the second vibration-damping connector 31, forming an air layer 32. The second vibration-damping connector 31 is evenly arranged between the vacuum noise reduction unit 2 and the outer layer noise reduction unit 3, and the arrangement method includes but is not limited to triangle, rectangle, honeycomb, plum blossom, chessboard, snake, radial, irregular, etc. The length of the second vibration-damping connector 31 is the same as the thickness of the air layer 32, and the vibration-damping method includes but is not limited to spring vibration-damping, rubber vibration-damping or other damping element vibration-damping, and the installation method of the second vibration-damping connector 31 adopts the method of bonding, bolt connection or integral vulcanization molding. The thickness of the air layer 32 is 50 to 100 mm, and the air layer can effectively reduce the propagation of noise vibration, further enhancing the noise reduction effect. The air layer 32 is connected to a temperature control device, which includes a thermometer 321, which can monitor the temperature of the air layer, so as to adjust the ventilation volume and meet the heat dissipation requirements. When the temperature control device detects that the temperature in the air layer is higher than the threshold, the purge pipeline connected to the air layer 32 is started to cool down (not shown in the figure). The outer substrate 33 is a micro-perforated plate with a thickness of 0.4-0.8 mm, an aperture of 1.5-4 mm, and a perforation rate of 8-18%. It is connected to the second vibration-damping connector 31 of the outer layer. The perforation patterns include but are not limited to rectangular holes, square holes, diamond holes, round holes, oblong holes, hexagonal holes, cross holes, triangular holes, long waist holes, plum blossom holes, fish scale holes, pattern holes, eight-shaped nets, herringbone holes, five-pointed star holes, irregular holes, bulging holes, special-shaped holes, louver holes, etc. The outer covering layer 34 can be made of non-woven fabrics, glass fiber cloth or glass fiber cloth, etc., with a thickness of 0.2 mm and a surface density of 45-65 g / m 2 The outer sound-absorbing layer 35 is made of porous sound-absorbing materials, including but not limited to rock wool, slag wool, ultra-fine glass wool, polyurethane, ethyl formate and its products, with a sound absorption coefficient of ≥0.6, and the sound-absorbing material accounts for no less than 30% of the panel area. The thickness is 25-50 mm. The optimal bulk density parameters of different materials are different, generally selected between 24 and 80 KN / m3. The panel of the outer sound insulation layer 36 is made of aluminum-plastic plate with a thickness of 0.4-1.0 mm.

[0046] The inner noise reduction unit 1 in Example 2 can effectively block mid- and high-frequency noise, and the vacuum layer 22 of the vacuum noise reduction unit 2 can prevent the propagation of sound in the full frequency band. The heat-conducting connecting piece 23 that runs through the inner noise reduction unit 1 and the sealed vacuum layer 22 can not only have a good blocking effect on the mid-, low-, and high-frequency noise, but also help to dissipate heat. The outer noise reduction unit 3 belongs to the noise reduction reinforcement layer, and the setting of its air layer 32 helps to hinder the propagation of sound. The outer noise reduction unit 3 can further reduce the mid- and high-frequency noise. The three-layer noise reduction unit in Example 2 of the present invention can reduce the equipment pipeline noise by 25 to 30 decibels.

[0047] Example 3

[0048] Embodiment 3 is a specific application embodiment of the noise reduction device of the present invention. When the noise spectrum of the high-noise equipment pipeline presents broadband and high-intensity characteristics, and the equipment pipeline temperature is between 30 and 40°C, and the temperature difference between the internal and external air is less than or equal to 5°C, the noise reduction device of the present invention only uses the inner layer noise reduction unit 1 and the vacuum noise reduction unit 2, that is, the structure of embodiment 1: specifically, the inner layer substrate 11 is pasted with the inner covering layer 12, the inner covering layer 12 is filled with the inner sound absorbing layer 13, the inner sound absorbing layer 13 is pasted with the inner sound insulation layer 14, the inner sound insulation layer 14 is connected to the vacuum outer skeleton layer 24 through the first vibration reduction connector 21, the vacuum layer 22 is evacuated by a vacuum pump, and the heat conductive connecting piece 23 made of high thermal conductivity material is selected from porous silicon carbide, graphene and other materials and their products, which have good barrier effect on the full-band noise of medium, low and high frequencies, and at the same time have good heat dissipation effect.

[0049] The noise reduction device composed of noise reduction units can be made into a soundproof wall structure or a soundproof room structure as a whole. Its installation method can use a light steel keel as a skeleton and fix it by various fixing methods such as clamping, hanging, buckling, and riveting. When there are special process requirements, such as inspection and maintenance doors and windows, process operation doors and windows, instrument reading doors and windows, and process pipelines or cables, etc., corresponding doors and windows or openings can be opened on the noise reduction device, but the sealing materials of the doors and windows or openings must be filled to ensure their sealing and prevent sound leakage. When in use, start the vacuum pump and open the vacuum valve. When the vacuum gauge shows less than 0.5 atmospheres, the closed cavity of the vacuum layer meets the vacuum requirements, and then close the vacuum valve and vacuum pump. At this time, the vacuum layer has a medium, low, high, and multi-frequency selective noise reduction function. At the same time, the heat generated by the high-noise equipment pipeline will be transferred to the outside through the heat-conducting connecting piece 23, so that the temperature inside the noise reduction device of the present invention is consistent with the external temperature, achieving the purpose of heat dissipation. In addition, if local high temperature is formed in the noise reduction device of the present invention, exhaust equipment can be installed at the local location for ventilation and heat dissipation. The inlet and outlet ports are set according to the local summer dominant wind direction and the properties of the medium in the pipeline of the high-noise equipment, and the inlet and outlet ports can be noise-reducing.

[0050] Example 4

[0051] Embodiment 4 is another specific application embodiment of the noise reduction device of the present invention. When the noise spectrum of the pipeline of high-noise equipment presents broadband and high-intensity characteristics, due to special requirements such as explosion-proof and fire-proof, it is not allowed to install a closed soundproof cover or soundproof room structure. It is only necessary to install a soundproof barrier (i.e., soundproof wall) on the inspection route. The soundproof wall only includes an inner layer noise reduction unit 1 and a vacuum noise reduction unit 2. The soundproof wall is specifically composed of an inner layer substrate 11 with an inner covering layer 12 attached to the outside, an inner sound-absorbing layer 13 filled outside the inner covering layer 12, an inner sound-absorbing layer 13 attached to the outside of the inner sound-absorbing layer 13, and an inner sound-insulating layer 14 attached to the outside of the inner sound-insulating layer 14. The inner sound-insulating layer 14 is connected to the vacuum outer skeleton layer 24 through a first vibration-damping connector 21. The vacuum layer 22 is evacuated by a vacuum pump. The heat-conducting connecting piece 23 is made of porous silicon carbide, graphene and other materials and their products, which not only have a good barrier effect on the full-band noise of medium, low and high frequencies, but also have a good heat dissipation effect.

[0052] Example 5

[0053] Embodiment 5 is another specific application embodiment of the noise reduction device of the present invention. When the noise spectrum of the high-noise equipment pipeline presents broadband and high-intensity characteristics, and the equipment pipeline temperature is between 40 and 60°C (the surface temperature of the general high-temperature equipment pipeline in the chemical industry is less than 60°C), and the temperature difference between the internal and external air is 10°C ≤ ≤ 30°C, this embodiment 5 includes an inner layer noise reduction unit 1, a vacuum noise reduction unit 2 and an outer layer noise reduction unit 3. The noise reduction device is specifically composed of an inner layer substrate 11 with an inner covering layer 12 attached to the outside, an inner sound absorbing layer 13 filled outside the inner covering layer 12, an inner sound insulation layer 14 attached to the inner sound absorbing layer 13, and an inner sound insulation layer 14 connected to the vacuum outer skeleton layer 24 through a first vibration reduction connector 21. The vacuum layer 22 is evacuated by a vacuum pump. The heat conductive connecting piece 23 is made of porous silicon carbide, graphene and other materials and their products, which have a good barrier effect on the full-band noise of medium, low and high frequencies, and a good heat dissipation effect. The vacuum noise reduction unit 2 is connected to the outer noise reduction unit 3 through the second vibration reduction connector 31. The combination and arrangement order of the material layer structure of the outer noise reduction unit 3 is the same as that of the inner noise reduction unit 1. The air layer 32 is connected to the low-pressure and low-temperature purge pipeline of the chemical enterprise. At the same time, a temperature monitoring instrument is set. If the temperature exceeds the set threshold requirement, the temperature is controlled by the purge flow to achieve the purpose of heat dissipation.

[0054] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. Any simple modifications, equivalent changes and modifications made to the above exemplary embodiments should fall within the scope of protection of the present invention.

Claims

1. A multi-frequency selective noise reduction device, characterized in that: include: The inner noise reduction unit is arranged on the side close to the noise source and is provided with the following components from the inside to the outside: An inner substrate, which is a micro-perforated plate; An inner cover layer bonded to the inner substrate; An inner sound-absorbing layer, which is made of a porous sound-absorbing material; An inner sound insulation layer, which is a panel structure; The vacuum noise reduction unit is provided with a vacuum outer frame, which is supported on the panel of the inner sound insulation layer through a first vibration reduction connecting piece to form a closed vacuum layer; the vacuum noise reduction unit also includes a heat conductive connecting piece, which runs through the inner noise reduction unit and the closed vacuum layer.

2. The multi-frequency selective noise reduction device according to claim 1, characterized in that: The thermally conductive connecting piece is made of porous silicon carbide or graphene.

3. The multi-frequency selective noise reduction device according to claim 2, characterized in that: The pore size of the thermally conductive connecting piece is 50nm-100um, the porosity is 25%-50%, and the thermal conductivity is 50-250W / m·k.

4. The multi-frequency selective noise reduction device according to claim 1, characterized in that: The thickness of the vacuum layer is 15 to 30 mm; the vacuum degree is less than or equal to 0.5 atmosphere.

5. The multi-frequency selective noise reduction device according to claim 1, characterized in that: The first vibration-damping connecting member is evenly arranged in the vacuum layer, and the first vibration-damping connecting member is a vibration-damping spring or a vibration-damping rubber.

6. The multi-frequency selective noise reduction device according to claim 1, characterized in that: The micro-perforated plate is an aluminum plate or a galvanized steel plate, the plate thickness of the micro-perforated plate is 0.4 to 0.8 mm, the hole diameter is 1.5 to 4 mm, and the perforation rate is 8% to 18%.

7. The multi-frequency selective noise reduction device according to claim 1, characterized in that: The inner coating is made of non-woven fabric, glass fiber cloth or glass fiber cloth; the thickness of the inner coating is 0.2 mm, and the surface density is 45 to 65 g / m 2 .

8. The multi-frequency selective noise reduction device according to claim 1, characterized in that: The porous sound-absorbing material is made of rock wool, slag wool, ultra-fine glass wool, polyurethane or ethyl formate; the thickness of the porous sound-absorbing material is 25 to 50 mm, the sound absorption coefficient is greater than or equal to 0.6, and the bulk density of the sound-absorbing material is 24 to 80 KN / m 3 .

9. The multi-frequency selective noise reduction device according to claim 1, characterized in that: The panel of the inner sound insulation layer is an aluminum-plastic plate with a thickness of 0.4 to 1.0 mm.

10. The multi-frequency selective noise reduction device according to claim 1, characterized in that: The noise reduction device as a whole is a sound insulation wall structure or a sound insulation room structure.

11. A multi-frequency selective noise reduction device, characterized in that: include: The inner noise reduction unit is arranged on the side close to the noise source and is provided with the following components from the inside to the outside: An inner substrate, which is a micro-perforated plate; An inner cover layer bonded to the inner substrate; An inner sound-absorbing layer, which is made of a porous sound-absorbing material; An inner sound insulation layer, which is a panel structure; A vacuum noise reduction unit is provided with a vacuum exoskeleton, which is supported on the panel of the inner sound insulation layer through a first vibration-damping connector to form a closed vacuum layer; the vacuum noise reduction unit also includes a heat-conducting connecting piece, which runs through the inner noise reduction unit and the closed vacuum layer; an outer noise reduction unit has the same layered structure as the inner noise reduction unit, an air layer is provided between the outer noise reduction unit and the vacuum exoskeleton, and second vibration-damping connecting pieces are evenly arranged in the air layer.

12. The multi-frequency selective noise reduction device according to claim 11, characterized in that: The thickness of the air layer is 50 to 100 mm.

13. The multi-frequency selective noise reduction device according to claim 11, characterized in that: A temperature control device is connected in the air layer. When the temperature control device detects that the temperature in the air layer is higher than a threshold value, a purge pipeline connected in the air layer is started to cool down the temperature.

14. The multi-frequency selective noise reduction device according to claim 11, characterized in that: The noise reduction device as a whole is a sound insulation wall structure or a sound insulation room structure.

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