CN220203039U - Resonant cavity sound absorption structure and low-frequency sound insulation heat preservation wall - Google Patents
Resonant cavity sound absorption structure and low-frequency sound insulation heat preservation wall Download PDFInfo
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- CN220203039U CN220203039U CN202321007563.4U CN202321007563U CN220203039U CN 220203039 U CN220203039 U CN 220203039U CN 202321007563 U CN202321007563 U CN 202321007563U CN 220203039 U CN220203039 U CN 220203039U
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- 238000009413 insulation Methods 0.000 title claims abstract description 31
- 238000004321 preservation Methods 0.000 title claims abstract description 30
- 238000010521 absorption reaction Methods 0.000 title abstract description 80
- 238000003780 insertion Methods 0.000 claims abstract description 24
- 230000037431 insertion Effects 0.000 claims abstract description 24
- 239000006096 absorbing agent Substances 0.000 claims abstract description 21
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- 238000001746 injection moulding Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 2
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- 238000004458 analytical method Methods 0.000 description 12
- 238000013461 design Methods 0.000 description 10
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- 238000004364 calculation method Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 5
- 238000004088 simulation Methods 0.000 description 5
- 230000000737 periodic effect Effects 0.000 description 4
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- 239000003365 glass fiber Substances 0.000 description 3
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- 239000006098 acoustic absorber Substances 0.000 description 2
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- 239000002861 polymer material Substances 0.000 description 2
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- 238000009795 derivation Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000030279 gene silencing Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
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- 229920000642 polymer Polymers 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/90—Passive houses; Double facade technology
Abstract
The utility model provides a resonant cavity sound absorption structure, which comprises a hollow outer cavity and a cannula penetrating into the inner part from the cavity wall of the outer cavity; one end of the cannula positioned outside the outer cavity is opened, and the other end is closed; the pipe wall of the insertion pipe, which is positioned in the outer cavity and is close to the opening end, is provided with a small hole; a resonance sound cavity is formed between an outer cavity of the resonance cavity sound absorption structure and the insertion pipe, and air in the sound cavity generates resonance along with sound waves to consume sound wave energy; the utility model also provides a low-frequency sound insulation heat preservation wall body applying the resonant cavity sound absorption structure, which comprises two layers of wallboards arranged in parallel and a resonant sound absorber arranged between the two layers of wallboards and along the periphery of the wallboards, wherein the resonant sound absorber comprises a plurality of resonant cavity sound absorption structures which are sequentially connected, and the low-frequency sound insulation heat preservation wall body can carry out sound energy dissipation on sound waves entering between the two layers of wallboards through the resonant sound absorber, so that the sound insulation capability of the wall body can be improved in an environment-friendly and effective manner.
Description
Technical Field
The utility model relates to the technical field of power environmental protection, in particular to a resonant cavity sound absorption structure and a low-frequency sound insulation heat preservation wall body.
Background
Along with the improvement of the living standard of people, the noise comfort requirement has become one of key technical indexes of transformer substation construction, in order to meet the requirement of the power market on low noise, the low-frequency noise isolation of a transformer has become one of main performance indexes of the transformer substation construction, and for an indoor transformer, the environment used by the indoor transformer is a closed scene, and the low-frequency noise of the transformer is easy to penetrate through a closed wall and transmit to the outside due to the fact that the corresponding wavelength of the low-frequency noise of the transformer is long, so that the surrounding environment is influenced. The traditional noise reduction method needs to increase the thickness of the wall body and increase the use of non-environment-friendly materials such as glass fiber, and does not meet the environment-friendly requirement and the future development requirement of green electric power energy.
Disclosure of Invention
In order to solve the noise reduction and environmental protection problems of a transformer, the utility model provides a resonant cavity sound absorption structure, which comprises a hollow outer cavity and a cannula penetrating into the inner part from the cavity wall of the outer cavity; one end of the insertion tube positioned outside the outer cavity is open, and the other end of the insertion tube is closed; the cannula is positioned in the outer cavity and is provided with a small hole on the pipe wall close to the opening end.
Preferably, the shape of the outer cavity is cuboid.
Preferably, the cannula is L-shaped.
Preferably, the dimension of the cuboid along the length direction of the pipeline with the cannula positioned in the outer cavity is between 750mm and 900 mm.
Preferably, the cannula has an overall length of between 800mm and 900 mm.
Preferably, the sound absorption frequency of the resonant cavity sound absorption structure covers 100Hz to 500Hz.
Preferably, the resonant cavity sound absorbing structure is formed by machining and injection molding.
Based on the same thought, the utility model also provides a low-frequency sound insulation heat preservation wall body, which comprises: two layers of wallboards arranged in parallel and a resonance sound absorber arranged between the two layers of wallboards and along the periphery of the wallboards; the resonance sound absorber comprises a plurality of resonance cavity sound absorbing structures which are sequentially connected, and the opening ends of the resonance cavity sound absorbing structures face to an air layer between the two layers of wallboards; the resonant cavity sound absorption structure is provided by the utility model.
Preferably, the wallboard and the resonance absorber are connected in a manner comprising mechanical connection and embedded.
Preferably, the wallboard comprises bricks, concrete and high polymer materials.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model provides a resonant cavity sound absorption structure, which comprises a hollow outer cavity and a cannula penetrating into the inner part from the cavity wall of the outer cavity; one end of the cannula positioned outside the outer cavity is opened, and the other end is closed; the pipe wall of the insertion pipe, which is positioned in the outer cavity and is close to the opening end, is provided with a small hole; a resonance sound cavity is formed between the outer cavity of the resonance cavity sound absorption structure and the insertion pipe, when the frequency of an incident sound wave is close to the natural frequency of the resonance cavity sound absorption structure, air in the sound cavity generates resonance effect along with the sound wave to consume sound wave energy, and the sound absorption frequency is adjusted through the position and the size of the small hole on the insertion pipe, so that the absorption of noise with specific frequency is achieved, and meanwhile, the resonance cavity sound absorption structure meets the environmental protection requirement;
the utility model also provides a low-frequency sound insulation heat preservation wall body applying the resonant cavity sound absorption structure, the low-frequency sound insulation heat preservation wall body comprises two layers of wallboards which are arranged in parallel and a resonant sound absorber which is arranged between the two layers of wallboards and is arranged along the periphery of the wallboards, the resonant sound absorber comprises a plurality of resonant cavity sound absorption structures which are connected in sequence, and the opening end of each resonant cavity sound absorption structure faces to an air layer between the two layers of wallboards; the low-frequency sound insulation and heat preservation wall body performs sound energy dissipation on sound waves entering between two layers of wallboards through the resonance sound absorber, does not need to increase the thickness of the wall body and use materials such as glass fiber, and can effectively improve the sound insulation capacity of the wall body in an environment-friendly manner.
Drawings
FIG. 1 is a schematic diagram of a resonant sound absorbing structure of the present utility model;
FIG. 2 is a cross-sectional view of the resonant sound absorbing structure of example 1;
FIG. 3 is a dimensional design of the resonant sound absorbing structure of example 1;
FIG. 4 is a schematic diagram of the aperture of the resonant sound absorbing structure of example 1;
FIG. 5 is a schematic view of the structure of the low-frequency sound insulation and heat preservation wall in embodiment 2;
FIG. 6 is a graph showing the analysis of the sound absorption effect of the low-frequency sound insulation and heat preservation wall of example 2;
reference numerals: 1. a wallboard; 2. a resonance absorber; 3. an air layer; 4. a resonant acoustic cavity; 5. a small hole; 6. an outer cavity; 7. and (3) inserting a tube.
Detailed Description
For a better understanding of the present utility model, reference is made to the following description of the utility model taken in conjunction with the accompanying drawings.
Example 1:
the present embodiment provides a resonant cavity sound absorbing structure, as shown in fig. 1, which includes a hollow outer cavity 6 and a cannula 7 penetrating into the interior from the cavity wall of the outer cavity 6; one end of the cannula 7 positioned outside the outer cavity 6 is open, and the other end is closed; the cannula 7 is positioned in the outer cavity 6 and the wall of the cannula near the open end is provided with a small hole 5. The resonant cavity sound absorption structure can be arranged between the hollow double-layer structures in an embedded or mechanical connection mode, and the resonant cavity 4 is formed between the outer cavity 6 of the resonant cavity sound absorption structure and the insertion pipe 7, so that when the frequency of an incident sound wave is close to the natural frequency of the resonant cavity sound absorption structure, air in the resonant cavity 4 generates resonance action along with the sound wave, the sound wave energy is consumed, and the sound absorption frequency is adjusted through the position and the size of the small hole 5 on the insertion pipe 7, so that the absorption of noise with specific frequency is achieved.
The shape of the outer cavity 6 and the cannula 7 is not limited, in this embodiment, the outer cavity 6 is a cuboid, the cross section of the cannula 7 is rectangular, and the cannula 7 penetrates into the outer cavity 6 from the upper end surface of the outer cavity 6 and bends along the length direction of the outer cavity 6. As shown in fig. 1, 2 or 4, the pipe wall of the side of the insertion pipe 7 inside the outer cavity 6 is provided with a small hole 5, and the shape of the small hole 5 is not limited, and can be a square hole, a rectangular hole, a round hole or the like, or can penetrate through two side wall surfaces of the insertion pipe 7, and the sound absorption effect of the sound absorption structure of the resonant cavity is specifically determined.
The resonant cavity sound absorbing structure of the present utility model can be sized by the following method.
The calculation formulas of two target sound absorption frequencies of the sound absorption structure of the resonant cavity can be obtained by the acoustic theory derivation of the Helmholtz resonant cavity are shown in the formula (1) and the formula (2) respectively. The frequency range of the transformer is generally 100 Hz-500 Hz, so that the first target sound absorption frequency f can be set 1 =100 Hz, second target sound absorption frequency f 2 200Hz was taken. Because the frequencies corresponding to the 3/4 and 5/4 wavelength effects are 3f respectively 1 And 5f 1 Namely 300Hz and 500Hz, the resonant cavity sound absorption structure designed by the method can realize the combination of 1/4 wavelength effect and 1/2 wavelength effect, and f 2 The frequency multiplication corresponding to (200 Hz) is 400Hz, so that the full-frequency band sound absorption of 100 Hz-500 Hz frequency multiplication of the transformer can be realized through the integral combination and design of the resonant cavity sound absorption structure.
From (1) and f 1 The total length L1 of cannula 7 can be determined by =100 Hz, by formulas (2) and f 2 =200 Hz, and the structural dimensions of the outer cavity 6 can be determined in combination with the total length L1 of the cannula 7. Because the wall thickness of the outer cavity 6 and the cannula 7 is thinner, the wall thickness of the outer cavity 6 and the cannula 7 can be ignored in the design process to perform approximate calculation. As shown in fig. 2, l1=la+lb, where La is the horizontal section length of the cannula 7 and Lb is the vertical section length of the cannula 7. The length, width and height of the outer cavity 6 are determined by the formula (2) in combination with the total length L1 of the insertion tube 7, and the size of H can be determined in combination with the practical application space requirement of the sound absorption structure of the resonant cavity, for example, when the sound absorption structure of the resonant cavity is applied between double-layer wallboards, the size of H and W can be designed to be equal to the size of the distance between the double-layer wallboards. In addition, since the length dimension L of the outer cavity 6 is larger than the horizontal segment length dimension La of the cannula 7, it is necessary to satisfy La requirements in determining the L dimension.
Wherein L1 is a cannula 7Total length f of (f) 1 For a first target sound absorption frequency of the resonant cavity sound absorption structure, c is the speed of sound, a is a first coefficient, a=4.
Wherein f 2 The second target sound absorption frequency of the resonant cavity sound absorption structure is c sound velocity, L is the length of the outer cavity 6, W is the height of the cross section of the outer cavity 6, H is the width of the cross section of the outer cavity 6, b is a second coefficient, b=2.
According to the structural dimension calculation results of the outer cavity 6 and the insertion pipe 7, the CAE modeling analysis method is adopted to finely adjust the sound absorption frequency of the sound absorption structure of the resonant cavity, and the sound absorption frequency is generally adjusted in detail within the range that the dimension deviation is not higher than 10 percent until the sound absorption peak value of the analysis frequency corresponding to the analysis accurately falls at 200Hz. The fine adjustment can be specifically performed in the following manner: comparing the simulated sound absorption frequency of the resonance sound absorption structure with 200Hz, if the simulated sound absorption frequency is higher than 200Hz, increasing the structural size of the insertion pipe 7 and/or the outer cavity 6, and if the simulated sound absorption frequency is lower than 200Hz, shortening the structural size of the insertion pipe 7 and/or the outer cavity 6, and carrying out sound absorption simulation again on the model with the adjusted size. The above process is repeated until the analysis of the corresponding frequency absorption peak value accurately falls at 200Hz. In the simulation analysis process, the simulation sound absorption frequency can have certain change due to the position and the size of the small hole 5, and accurate tuning design can be performed by means of numerical analysis.
According to the calculation method, when the design value of the length dimension L of the outer cavity (6) is between 750mm and 900mm and the design value of the total length L1 of the insertion pipe (7) is between 800mm and 900mm, the resonant cavity sound absorption structure can realize full-frequency sound absorption of 100 Hz-500 Hz frequency multiplication of the transformer.
The resonant cavity sound absorption structure is different from a conventional Helmholtz resonant cavity, the Helmholtz resonant cavity has a single-frequency sound absorption effect, and the resonant sound cavity 4 integrates the resonance of a closed air layer and the 1/4 wavelength effect, so that more single-frequency sound absorption effects are realized. The resonant cavity sound absorption structure isolates noise by utilizing the resonant sound absorption principle, can reduce the use of non-environment-friendly materials such as rock wool, glass fiber and the like, can be formed in a mechanical processing or polymer injection molding mode, is convenient to produce and construct, and can reduce the comprehensive cost of production, construction, materials, environmental protection and the like.
Because the noise frequency range of the power equipment is relatively regulated, in practical application, the resonant cavity sound absorption structure can be produced in a modularized manner, and the universal popularization is realized through the modularized design of the factory production end. For example, the sound absorbing structures of the plurality of resonant cavities are spliced to form the sound absorber module, the splicing mode can be bonding or mechanical connection or embedding, and a modularized product with a fixed size is formed according to a specific use environment. The modularized products can be connected in a mechanical or internal opposite insertion mode to form a periodic array configuration, so that the effects of convenient disassembly and construction are achieved. The best effect of further optimizing the acoustic performance by adopting the periodic array configuration and the periodic configuration in the use process still belongs to the protection scope of the patent.
Example 2:
this embodiment provides a low frequency sound insulation heat preservation wall body, and as shown in fig. 5, this low frequency sound insulation heat preservation wall body includes parallel arrangement's two-layer wallboard 1 and sets up between two-layer wallboard 1 and along the resonance acoustic absorber 2 of arranging in the periphery of wallboard 1, and resonance acoustic absorber 2 includes the resonant cavity sound absorbing structure in a plurality of embodiment 1 that connect gradually, and resonant cavity sound absorbing structure's open end is towards air bed 3 between two-layer wallboard 1. The low-frequency sound insulation heat preservation wall body absorbs and dissipates low-frequency sound waves entering the wall body through resonance of the resonance sound absorber 2, low-frequency sound insulation capacity of the wall body can be effectively improved, and meanwhile an environment-friendly effect is achieved.
The wall board 1 is made of bricks, concrete, high polymer materials and the like according to the use situation and weight requirements of the indoor transformer, and can also be made of the existing wall structure. An air layer 3 is arranged between the two layers of wallboards 1, and the thickness of the air layer 3 can be optimized according to the heat conductivity coefficient of the air layer 3, so that the effects of heat preservation and noise reduction are realized. The two side wallboards 1 and the resonance sound absorber 2 can be connected in a mechanical mode, such as bolts, embedded screws, buckles and the like, or can be connected in an embedded mode, such as holes or grooves are formed in the wallboards 1, and the resonance sound absorber 2 is embedded in the two side wallboards 1. In the later stage, the construction performance is considered, and a plurality of connecting structures are generally required to be added for ground fixation and surrounding fixation, so that the later stage of disassembly and maintenance are convenient.
The transformer is typically single frequency sound, so the resonance absorber 2 is mainly designed for single frequency sound absorption. The plurality of resonant cavity sound absorption structures are arranged along the periphery of the wallboard 1 to form a resonant sound absorber 2, and the low-frequency sound wave is absorbed by utilizing the resonant sound absorption principle. The resonance sound absorber 2 is embedded in the periphery boundary of the double-layer wall body, so that the heat preservation and insulation effects of the double-layer wall body are not affected. The noise frequency range of the transformer is generally 100 Hz-500 Hz, and the resonant cavity sound absorption structure is designed in size according to the frequency range, so that low-frequency sound waves are absorbed and dissipated by the resonant sound absorber 2 in the double-layer wall body, and the low-frequency sound insulation capability of the double-layer wall body is improved.
From f 1 The total length L1 of the cannula 7 can be determined to be 0.85m by =100 Hz and equation (1). According to (2) and f 2 =200 Hz at this timeAbout 0.85m, the wall thickness of the outer lumen 6 and cannula 7 was ignored in the calculation. H is sized in combination with the space requirements between double wall panels. The thickness of the double-layer wall is not too thick to reduce the weight of the wall, so that W and H can be controlled to be 0.1m, and the combination of W and H is ∈>About 0.85m, the length L of the outer chamber 6 at this time being about 0.83m. As shown in fig. 3, since the length L of the outer cavity 6 is larger than the length La of the cannula 7 in the outer cavity 6, it is necessary to satisfy La requirements when determining the L size.
After the primary structure sizes of the outer cavity 6 and the insertion pipe 7 are determined, the structure sizes of the outer cavity 6 and the insertion pipe 7 are adjusted and optimized by adopting a modeling analysis method, so that the simulated sound absorption frequency of the resonance sound absorption structure just falls at f 2 I.e. 200Hz. In the embodiment, a CAE modeling analysis method is adopted to carry out the resonance sound absorption structureThe sound absorption frequency is finely tuned at 200Hz until the peak sound absorption of the analysis frequency is accurately at 200Hz. The specific adjustment method is that the simulated sound absorption frequency is compared with 200Hz, if the simulated sound absorption frequency is higher than 200Hz, the structural size of the insertion tube 7 and/or the outer cavity 6 is increased, and if the simulated sound absorption frequency is lower than 200Hz, the structural size of the insertion tube 7 and/or the outer cavity 6 is shortened, and the adjustment is generally carried out within the range of 10% of the dimensional deviation. And (5) carrying out sound absorption simulation on the model with the adjusted size again. The above process is repeated until the analysis of the corresponding frequency absorption peak value accurately falls at 200Hz.
In this embodiment, as shown in fig. 3, the length dimension L of the outer cavity 6 is 800mm, the total length L1 of the cannula 7 is 850mm, the length La of the cannula 7 in the outer cavity 6 is 750mm, the length Lb of the bent portion of the cannula 7 is 100mm, the length h of the portion of the cannula 7 outside the outer cavity 6 is 40mm, and as shown in fig. 4, the small hole 5 is a square hole of 5mm×5 mm. As shown in FIG. 6, the simulation analysis of the sound absorption effect of the sound absorption structure of the resonant cavity shows that the sound absorption coefficient of 100Hz is 0.6, the corresponding frequencies of 3/4 and 5/4 wavelength effects are 300Hz and 500Hz, the sound absorption coefficient of 200Hz is 0.8, and the corresponding frequency multiplication is 400Hz. Therefore, through the integral combination and design of the structure, the full-band sound absorption of 100-500 Hz frequency multiplication of the transformer can be realized.
The low-frequency sound insulation heat preservation wall body can be subjected to modularized design, universal popularization is achieved, and modularized products with fixed sizes are formed according to the use environment, so that the low-frequency sound insulation heat preservation wall body is convenient to detach and construct. The plurality of low-frequency sound insulation heat preservation walls can be connected in a mechanical or internal opposite insertion mode to form a periodic array configuration, so that the aim of silencing different single-frequency sounds is fulfilled, the low-frequency sound waves penetrating through the walls are captured and dissipated in an air layer, and the key frequency of the transformer is effectively shielded.
The low-frequency sound insulation heat preservation wall combines the comprehensive advantages of the noise reduction performance and the heat preservation performance of the double-layer structure of the low-frequency sound insulation heat preservation wall, and achieves the comprehensive effects of heat preservation and environmental protection through the design of the double-layer wall plate and the design of the resonance sound absorption structure. The low-frequency sound insulation and heat preservation wall body can control product quality through later-stage modularized production, and improves the performance consistency of products, so that the low-frequency sound insulation and heat preservation wall body is rapidly applied to noise reduction markets. According to the performance test of the low-frequency sound insulation and heat preservation wall body in a laboratory, the single-frequency noise reduction performance improvement (5-10) dB of 100Hz can be realized.
The foregoing is illustrative of the present utility model and is not to be construed as limiting thereof, but rather as providing for the use of additional embodiments within the spirit and scope of the present utility model.
Claims (10)
1. A resonant cavity sound absorbing structure, characterized in that it comprises a hollow outer cavity (6) and a cannula (7) penetrating into the interior from the cavity wall of the outer cavity (6); one end of the insertion tube (7) positioned outside the outer cavity (6) is open, and the other end is closed; the insertion tube (7) is positioned in the outer cavity (6) and a small hole (5) is arranged on the tube wall close to the opening end.
2. The resonant cavity sound absorbing structure according to claim 1, characterized in that the outer cavity (6) is rectangular in shape.
3. The resonant cavity sound absorbing structure according to claim 2, characterized in that the cannula (7) is L-shaped.
4. A resonant cavity sound absorbing structure according to claim 3, characterized in that the dimension of the cuboid along the length of the pipe where the cannula (7) is located within the outer cavity (6) is between 750mm and 900 mm.
5. A resonant cavity sound absorbing structure according to claim 3, characterized in that the total length of the cannula (7) is between 800mm and 900 mm.
6. The resonant cavity sound absorbing structure of claim 5, wherein the sound absorbing frequency of the resonant cavity sound absorbing structure covers 100Hz to 500Hz.
7. The resonant cavity sound absorbing structure of claim 1, wherein the resonant cavity sound absorbing structure is formed by machining and injection molding.
8. The utility model provides a low frequency sound insulation heat preservation wall body which characterized in that, low frequency sound insulation heat preservation wall body includes: two layers of wallboards (1) arranged in parallel and a resonance sound absorber (2) arranged between the two layers of wallboards (1) and along the periphery of the wallboards (1); the resonance sound absorber (2) comprises a plurality of resonance cavity sound absorbing structures which are sequentially connected, and the opening ends of the resonance cavity sound absorbing structures face an air layer (3) between the two layers of wallboards (1); the resonant cavity sound absorbing structure is the resonant cavity sound absorbing structure of any one of claims 1 to 7.
9. The low-frequency sound-insulation heat-preservation wall body according to claim 8, wherein the connection mode of the wallboard (1) and the resonance sound absorber (2) comprises mechanical connection and embedded connection.
10. The low-frequency sound-insulation heat-preservation wall body according to claim 8, wherein the wall board (1) is made of bricks, concrete and high-molecular materials.
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| CN202321007563.4U CN220203039U (en) | 2023-04-28 | 2023-04-28 | Resonant cavity sound absorption structure and low-frequency sound insulation heat preservation wall |
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