CN117386042A - Ventilating and silencing wall unit, wall and design method - Google Patents
Ventilating and silencing wall unit, wall and design method Download PDFInfo
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- CN117386042A CN117386042A CN202311221302.7A CN202311221302A CN117386042A CN 117386042 A CN117386042 A CN 117386042A CN 202311221302 A CN202311221302 A CN 202311221302A CN 117386042 A CN117386042 A CN 117386042A
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- 238000009423 ventilation Methods 0.000 claims abstract description 65
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- 238000002347 injection Methods 0.000 claims description 7
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- 239000007769 metal material Substances 0.000 claims description 4
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- 238000004088 simulation Methods 0.000 claims description 4
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 230000017525 heat dissipation Effects 0.000 abstract description 7
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H5/00—Buildings or groups of buildings for industrial or agricultural purposes
- E04H5/02—Buildings or groups of buildings for industrial purposes, e.g. for power-plants or factories
- E04H5/04—Transformer houses; Substations or switchgear houses
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/085—Cooling by ambient air
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
- E04B2001/8457—Solid slabs or blocks
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- Architecture (AREA)
- Physics & Mathematics (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Electromagnetism (AREA)
- Acoustics & Sound (AREA)
- Power Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Building Environments (AREA)
Abstract
The invention provides a ventilation and noise reduction wall unit, a wall body and a design method, wherein the wall body comprises a wallboard and a noise reduction unit; the silencing unit comprises a box structure, one side of the box structure is an opening side, and an acoustic wave projection port is formed in the side opposite to the opening side; the wall plate covers the opening side of the box structure, and an acoustic wave entrance opening is formed in the wall plate; the sound wave entrance port and the depth direction of the sound wave entrance port are not in the same straight line. The sound wave entrance port is formed in the wallboard, the sound wave projection port is formed in the sound attenuation unit, after sound waves enter the sound attenuation unit through the sound wave entrance port, the sound waves generate resonance in the sound attenuation unit, so that the sound waves come back and forth in the sound attenuation unit, dissipation of sound energy is realized, noise suppression is realized, the suppressed noise is discharged through the sound wave projection port, and the noise level of the transformer is reduced; the sound wave entrance port and the sound wave entrance port form a communicated channel, ventilation of the periphery of the transformer is increased, and heat dissipation of the transformer is achieved; the device provided by the invention has a simple structure and reduces the cost.
Description
Technical Field
The invention relates to the technical field of electric power environmental protection, in particular to a ventilation and noise reduction wall unit, a wall and a design method.
Background
Along with the improvement of the living standard of people, the noise comfort requirement becomes one of key technical indexes of the construction of a transformer substation; in order to meet the low noise requirement of the electric power market, low-frequency noise isolation of a transformer has become one of main performance indexes of transformer substation construction; for outdoor transformers, as the outdoor transformers are in an external application scene, the 100Hz low frequency of the transformer is longer in corresponding sound wave wavelength, so that long-distance transmission is easily caused by low-frequency noise, the noise level of the enclosing wall position of a transformer substation is affected, and then the surrounding urban area is affected. The traditional noise reduction method is to construct a noise reduction and sound insulation wall, and needs to increase the thickness of wall sound absorption materials and the use of non-environment-friendly materials such as glass fiber, so that the cost is increased and the environment-friendly cost is increased, and the requirements of the country on the future development of green electric power energy are not met; meanwhile, the temperature of the transformer can be high in the use process, and the heat dissipation efficiency of the transformer can be reduced due to the existence of the noise reduction and sound insulation wall, so that the transformer has the hidden danger of spontaneous combustion in the use process.
Disclosure of Invention
In order to solve the problems of defects and hidden dangers in the aspects of cost and heat dissipation of the traditional noise reduction method, the invention provides a ventilation noise reduction wall unit, which comprises a wallboard and a noise reduction unit;
the silencing unit comprises a hollow box structure, one side of the box structure is an opening side, and a hole-shaped sound wave projection port is formed in one side, opposite to the opening side, of the box structure;
the wall plate covers the opening side of the box-packed structure, and a hole-shaped sound wave entrance opening is formed in the wall plate;
the depth direction of the sound wave entrance port is not in the same straight line with the depth direction of the sound wave entrance port.
Preferably, the size of the sound wave entrance opening is the same as or different from the size of the sound wave entrance opening.
Preferably, the number of the sound wave projecting ports is one or more.
Preferably, when the sound wave projection port is one, the inner side surface of the sound wave projection port far away from the sound wave entrance port is coplanar with the inner side surface of the box structure close to the sound wave projection port;
when the number of the sound wave projection ports is multiple, the inner side surface of at least one sound wave projection port far away from the sound wave entrance port is coplanar with the inner side surface of the box-packed structure close to the sound wave projection port.
Preferably, the plurality of the silencing units are arranged in an array, and the opening sides face the same direction;
adjacent silencing units are in contact and fixedly connected with each other;
the wall plate covers one end of the openings of the plurality of silencing units;
the sound wave entrance ports are multiple, and each silencing unit is arranged corresponding to at least one sound wave entrance port.
Preferably, the wallboard is fixedly connected with the silencing unit in a mechanical connection mode.
Preferably, a clamping groove is formed in the side wall, facing the silencing unit, of the wallboard;
the clamping groove is a rectangular groove;
a plurality of the silencing units form a rectangular array structure;
the opening side of the rectangular array structure is embedded in the rectangular groove, and the peripheral wall of the opening side of the rectangular array structure is clamped with the rectangular groove;
and one side, far away from the sound wave injection port, of the clamping groove is provided with the sound wave injection port.
Preferably, the wall plate and the silencing unit are made of the same or different materials.
Preferably, the material comprises a high polymer material or a metal sheet material.
Based on the same inventive concept, the application also provides a ventilation and noise reduction wall body, which comprises a plurality of ventilation and noise reduction wall body units and connecting pieces;
the plurality of ventilation and noise reduction wall units are sequentially connected end to end through the connecting piece and are enclosed to form an annular structure;
the wall plate of the ventilation noise reduction wall body unit is positioned at the inner side of the annular structure;
the silencing unit of the ventilation silencing wall body unit is positioned at the outer side of the annular structure;
the sound-insulated device is arranged in the annular structure.
Preferably, the projection of the sound wave entrance opening of the wallboard along the horizontal direction is positioned above the sound wave projection opening of the silencing unit.
Preferably, the ventilation and noise reduction wall further comprises a plurality of vibration isolation devices;
the ventilation and noise reduction wall body is arranged on the ground or the base through the vibration isolation device.
Preferably, the vibration isolation device is a rubber vibration isolator.
Based on the same inventive concept, the application also provides a design method of the ventilation and noise reduction wall unit, which comprises the following steps:
according to the noise reduction requirement of the ventilation noise reduction wall unit, respectively determining the initial sizes of the wallboard, the noise reduction unit, the sound wave projection port and the sound wave entrance port of the ventilation noise reduction wall unit;
and (3) iteratively adjusting the initial size based on the noise reduction requirement and the sounding frequency band of the noise reduction device by using an acoustic simulation method, and determining the design sizes of the wallboard, the noise reduction unit, the acoustic wave projection port and the acoustic wave entrance port.
Preferably, the method for simulating acoustic waves iteratively adjusts the initial size based on the noise reduction requirement and the sounding frequency band of the noise reduction device, and determines the design sizes of the wallboard, the noise reduction unit, the acoustic wave projection port and the acoustic wave entrance port, including:
firstly, constructing an expansion cavity model based on initial dimensions of the wallboard, the silencing unit, the sound wave projection port and the sound wave entrance port, and taking the initial dimensions as current dimensions;
determining the acoustic wave energy transmission loss of the expansion cavity model with the current size based on a transmission loss calculation principle based on the sounding frequency band of the noise-reduced device;
thirdly, when the acoustic wave energy transmission loss of the expansion cavity model meets the noise reduction requirement, ending by taking the current size parameter as the design parameter of the expansion cavity model;
otherwise, the size parameter is adjusted to serve as the current size, and the second step and the third step are continuously executed until the acoustic wave energy transmission loss of the expansion cavity model meets the noise reduction requirement.
Preferably, the expansion cavity model is built based on CAD digital-analog.
Preferably, the transmission loss is calculated as follows:
wherein Δl is the acoustic energy transfer loss; m is the expansion ratio; k is the wave number of the sound wave in unit time; l is the length of the expansion cavity model.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a ventilation and noise reduction wall unit, which comprises a wallboard and a noise reduction unit; the silencing unit comprises a hollow box structure, one side of the box structure is an opening side, and a hole-shaped sound wave projection port is formed in one side, opposite to the opening side, of the box structure; the wall plate covers the opening side of the box-packed structure, and a hole-shaped sound wave entrance opening is formed in the wall plate; the depth direction of the sound wave entrance port is not in the same straight line with the depth direction of the sound wave entrance port. According to the device provided by the invention, the sound wave entrance port is formed in the wallboard, the sound wave projection port is formed in the sound attenuation unit, when sound waves enter the sound attenuation unit through the sound wave entrance port, the sound waves generate resonance in the sound attenuation unit, so that the sound waves can come back and forth in the sound attenuation unit, the dissipation of sound energy is realized, the suppression of noise is realized, the suppressed noise is discharged through the sound wave projection port, and the noise level of the transformer is reduced; the sound wave entrance port and the sound wave entrance port form a communicated channel, ventilation of the periphery of the transformer is increased, and heat dissipation of the transformer is achieved; meanwhile, the device provided by the invention has a simple structure and reduces the cost.
Drawings
FIG. 1 is a schematic view of a ventilation and noise reduction wall unit according to the present invention;
FIG. 2 is a longitudinal cross-sectional view of the ventilation and noise reduction wall unit of the present invention;
FIG. 3 is an enlarged view of portion A of FIG. 2 in accordance with the present invention;
FIG. 4 is a schematic view of the structure of the muffler unit of the present invention;
FIG. 5 is a schematic view of the wall panel of the present invention facing the muffler unit;
FIG. 6 is a schematic view of a splice of ventilation and noise reduction wall units according to the present invention;
FIG. 7 is an enlarged view of portion B of FIG. 6 in accordance with the present invention;
FIG. 8 is a schematic diagram of parameters of an acoustic inlet, a sound attenuating unit and an acoustic port according to the present invention.
Wherein, 1, wallboard; 2. a silencing unit; 3. an acoustic wave projection port; 4. an acoustic wave entrance port.
Detailed Description
For a better understanding of the present invention, reference is made to the following description, drawings and examples.
The invention provides a ventilation and noise reduction wall unit, which is characterized in that a sound wave entrance port is formed in a wallboard, a sound wave projection port is formed in the noise reduction unit, when sound waves enter the noise reduction unit through the sound wave entrance port, the sound waves generate resonance in the noise reduction unit, so that the sound waves can come back and forth in the noise reduction unit, the dissipation of sound energy is realized, the noise suppression is realized, the suppressed noise is discharged through the sound wave projection port, and the noise level of a transformer is reduced; the sound wave entrance port and the sound wave entrance port form a communicated channel, ventilation of the periphery of the transformer is increased, and heat dissipation of the transformer is achieved; meanwhile, the device provided by the invention has a simple structure and reduces the cost.
Example 1:
a ventilation and noise reduction wall unit, as shown in fig. 1 and 2, comprises a wallboard 1 and a noise reduction unit 2; the silencing unit 2 comprises a hollow box structure, one side of the box structure is an opening side, and a hole-shaped sound wave projection port 3 is formed in the side, opposite to the opening side, of the box structure; the wall plate 1 is covered on the opening side of the box structure, and a hole-shaped sound wave entrance opening 4 is formed in the wall plate 1; the depth direction of the sonic entrance 4 is not collinear with the depth direction of the sonic projection 3, as shown in fig. 3. The size of the sonic entrance 4 is the same as or different from the size of the sonic entrance 3. The ventilation and noise reduction wall unit provided by the embodiment can be used for an outdoor transformer. For convenience of description, in this embodiment, the wall plate 1 and the muffler unit 2 are each selected to have a square structure.
As shown in fig. 4, the number of the sonic projecting ports 3 is not limited, and may be one or more. When the sound wave projection port 3 is one, the inner side surface of the sound wave projection port 3 far away from the sound wave entrance port 4 is coplanar with the inner side surface of the box structure close to the sound wave projection port 3; when the sound wave throwing port 3 is a plurality of, the inner side surface of at least one sound wave throwing port 3 far away from the sound wave entrance port 4 is coplanar with the inner side surface of the box-packed structure close to the sound wave throwing port 3, so that rainwater can be conveniently discharged in rainy days. In this embodiment, the size of the sound wave entrance 4 depends on the ventilation requirement of the ventilation noise reduction wall unit in use.
The plurality of the silencing units 2 are arranged in an array manner, and the opening sides face the same direction; adjacent silencing units 2 are in contact and fixedly connected with each other; the wall plate 1 covers one end of the openings of the plurality of silencing units 2; the sound wave entrance ports 4 are multiple, and each silencing unit 2 is arranged corresponding to at least one sound wave entrance port 4.
When sound wave passes through sound wave entrance 4 and gets into in the amortization unit 2, because sound wave entrance 4 is little than the inside cross-section of amortization unit 2, the impedance characteristic of sound wave entrance 4 and amortization unit 2 is different to produce impedance mismatch effect, and then make an uproar falls to the low frequency sound wave that outdoor change produced.
The sound wave entrance port 4 and the sound wave projection port 3 are arranged in a staggered manner, so that the sound waves entering the silencing unit 2 generate resonance, and energy consumption is carried out. The number of the sound wave entrance ports 4 of the wallboard 1 is equal to the number of the silencing units 2, and specifically, each silencing unit 2 corresponds to one sound wave entrance port 4 and one sound wave projection port 3.
The interior of the silencing unit 2 is an air layer, and the design of a cavity can be carried out according to the reduced noise frequency band, so that the effects of water drainage, heat dissipation and noise reduction are realized; in this embodiment, the sound wave entrance port 4 and the sound wave entrance port 3 of the sound-deadening unit 2 form a communicating through hole through the sound-deadening unit 2, and heat dissipation can be achieved by heat radiation and heat conduction in the air layer.
The wallboard 1 is fixedly connected with the silencing unit 2 in a mechanical connection mode. The concrete structure is that a clamping groove is formed in the side wall of the wallboard 1 facing the silencing unit 2; the clamping groove is a rectangular groove, as shown in fig. 5; the plurality of silencing units 2 form a rectangular array structure; the opening side of the rectangular array structure is embedded in the rectangular groove, and the peripheral wall of the opening side of the rectangular array structure is clamped with the rectangular groove; one side of the clamping groove far away from the sound wave injection port 3 is provided with a sound wave injection port 4. The outer peripheral wall of the opening side of the rectangular array structure is clamped with the clamping groove in an interference fit mode and fixedly connected in an adhesive mode.
The mechanical connection mode of the wallboard 1 and the silencing unit 2 can also be selected as follows: the joint groove that wallboard 1 offered towards amortization unit 2 one side includes joint recess and follows the joint board that the inner wall week side of joint recess set up, and elastic deformation can take place for the joint board, and the joint board sets up with the inside wall of joint recess is integrative, and extends towards joint recess bottom, and the inside wall of joint board and joint recess has the contained angle. The outside wall of the opening of the silencing unit 2 is provided with the clamping convex block, when the silencing unit 2 is clamped with the wallboard 1, the clamping convex block is abutted with the clamping plate, the clamping plate is bent towards one side of the inside wall of the clamping groove by the abutting force until the clamping groove enters the clamping groove, and at the moment, the clamping plate is restored to be in the original state to clamp the clamping convex block. When the silencing unit 2 is clamped in the wallboard 1, the silencing unit 2 and the wallboard 1 are fixedly connected through screws in order to prevent the silencing unit 2 and the wallboard 1 from shaking mutually.
The wall plate 1 and the silencing unit 2 are made of the same or different materials. The material comprises a high polymer material or a metal sheet material. In the embodiment, the wallboard 1 and the silencing unit 2 are made of various materials such as high polymer materials or metal sheet metal materials; the selection of the material is related to the use scene of the transformer; the materials can be selected according to the environment and weight requirements of the use scene. When the ventilation and noise reduction wall unit needs to meet the A-level fireproof requirement, preparing the ventilation and noise reduction wall unit by adopting a metal sheet metal material; when the ventilation and noise reduction wall body unit needs to meet the flame-retardant requirement, a metal sheet metal material or a polymer material with the same flame-retardant grade can be adopted. If the requirements of flame retardance and light weight are simultaneously required to be met, a high polymer material can be adopted.
The ventilation and noise reduction wall unit provided by the embodiment forms an internal square cavity in a machining or high polymer injection molding mode, has certain size and space requirements, and can achieve the noise reduction purpose of different frequency bands by setting different sizes. The ventilation and noise reduction wall unit provided by the embodiment can inhibit the noise of the frequency range of 100-500Hz of the transformer by changing the size of the noise reduction unit 2, and meanwhile, the ventilation and noise reduction wall unit can be produced by molding, and an internal cavity is formed after one-step molding, so that the production cost is reduced; and the installation mode of the wallboard 1 and the silencing unit 2 can effectively solve the field construction problem, and the internal cavity drainage can be automatically carried out in rainy days through the design of the internal silencing unit 2 and the position arrangement of the sound wave inlet projection port 3. The silencing unit 2 provided in this embodiment mainly includes the silencing unit 2 inside, the sound wave entrance port 4 on the wallboard 1 and the sound wave entrance port 3 of the silencing unit 2, and sound waves enter the cavity through the opening, so that the low-frequency silencing of the transformer is realized.
According to the device provided by the embodiment, the acoustic wave propagation path of the transformer is set manually, namely noise acoustic waves generated by the transformer enter the silencing unit 2 through the acoustic wave entrance port 4 preferentially, and at the moment, the acoustic wave entrance port 4 and the silencing unit 2 are different in acoustic wave impedance due to the fact that the sectional area of the acoustic wave entrance port 4 is different from the sectional size of the silencing unit 2, so that the situation of impedance mismatch is generated, and noise entering the silencing unit 2 is subjected to noise reduction for the first time; after noise enters the silencing unit 2, the noise resonates according to the silencing unit 2, noise is reduced for the second time, the noise is discharged to the external environment through the sound wave projection port 3 of the silencing unit 2, and the influence of the noise is greatly reduced after the noise is reduced for the second time, so that the noise of the transformer is suppressed on a propagation path.
The noise reduction principle of the ventilation noise reduction wall unit of this embodiment is as follows: the section of the sound wave entrance port 4 is different from the section of the silencing unit 2 in size, so that the sound wave is mismatched in the silencing unit 2 through acoustic impedance, and internal loss is carried out. The silencing unit 2 performs low-frequency sound wave end face reflection and internal oscillation according to the impedance mismatch principle of the silencing unit 2 to realize sound energy dissipation; whereas sound waves not incident into the sound wave entrance 4 are reflected by the wall plate 1 to be reflected to high, the wall plate 1 forms a sound barrier in reflection and boundary diffraction of the sound waves, and at this time, the sound waves are reflected to the transformer sound source due to the sound barrier.
Specific parameters of the ventilation and noise reduction wall unit in this embodiment are not limited and can meet the noise reduction requirement of the application, and the following specific parameters of the ventilation and noise reduction wall unit are only used for reference:
silencer unit 2 size: 100 (width) X100 (height) X50mm (thickness), i.e. the cross-sectional dimension of the sound attenuating unit 2 is 100mmx100mm;
the size of the sound wave entrance port 4 and the size of the sound wave projection port 3 of the sound-deadening unit 2: 10mm (width) X5mm (height);
the 50mm thick parameter of the noise reduction unit 2 is set according to the low-frequency noise reduction capacity corresponding to the glass fiber cotton commonly used in the current transformer substation, and the wallboard 1 unit provided by the embodiment has better performance under the thicker condition.
Example 2:
the present embodiment provides a ventilation and noise reduction wall, as shown in fig. 6 and 7, including a plurality of ventilation and noise reduction wall units and connectors; the plurality of ventilation and noise reduction wall units are sequentially connected end to end through connecting pieces and are enclosed to form an annular structure; the wall board 1 of the ventilation noise reduction wall body unit is positioned at the inner side of the annular structure; the silencing unit 2 of the ventilation silencing wall unit is positioned at the outer side of the annular structure; the sound-insulated device is placed in the annular structure.
In order to facilitate drainage, the projection of the sound wave entrance 4 of the wall plate 1 in the horizontal direction is located above the sound wave entrance 3 of the sound-deadening unit 2. The wallboard 1 is towards by noise reduction device one side, and sound wave entrance 4 positions are higher than the sound wave entrance 3 of amortization unit 2, when ventilation amortization wall body unit and by noise reduction device installation use, the rainwater can fall into ventilation amortization wall body unit and by noise reduction device to in entering into amortization unit 2 through sound wave entrance 4, because the sound wave entrance 3 of amortization unit 2 is lower, the rainwater can follow the sound wave entrance 3 of amortization unit 2 and flow out.
The wallboard 1 is attached and fixed on the noise reducer. The plurality of ventilation and noise reduction wall units are connected through the adjacent wall boards 1 in a mechanical assembly or clamping or screw mode, the specific connection mode is not limited, and the fixed connection of the adjacent wall boards 1 can be realized. The connection mode is selected for connection in the embodiment, and the specific form of the connecting piece is a T-shaped bar-shaped convex block, a T-shaped groove and a screw. The wallboard 1 is located the T type recess of seting up the vertical direction on one side of vertical direction, and an organic whole is provided with the T type bar lug of vertical direction on the other side of vertical direction, T type bar lug and T type recess adaptation, when two adjacent wallboards 1 are installed, T type bar lug along vertical direction slidable mounting in T type recess. The T-shaped groove on the wallboard 1 at the annular corner is arranged on the side surface of the wallboard 1 facing the noise reduction device, and the T-shaped bar-shaped protruding block on the side plate connected with the T-shaped groove is arranged in the T-shaped groove. In order to increase the stability of the ventilation and noise reduction wall body, the adjacent wall board 1 pieces are reinforced by steam nails or welding, so that the extension connection of a plurality of ventilation and noise reduction wall body units in the horizontal direction is realized. In order to increase structural stability of the ventilation and noise reduction wall body, the T-shaped strip-shaped convex blocks are connected with the T-shaped grooves and then are fixedly connected with each other for the second time through screws.
In addition, the extending connection of the plurality of ventilating and silencing wall units in the vertical direction is the same as the extending connection of the ventilating and silencing wall units in the horizontal direction, however, at the moment, the ventilating and silencing wall units are respectively and equally provided with T-shaped strip-shaped lugs and T-shaped grooves on two side surfaces located on the upper side and the lower side, and the extending connection of the plurality of ventilating and silencing wall units in the vertical direction is realized through the connection of the T-shaped strip-shaped lugs and the T-shaped grooves.
The ventilation and noise reduction wall body also comprises a plurality of vibration isolation devices; the ventilation and noise reduction wall body is arranged on the ground or the base through the vibration isolation device. The vibration isolation device is a rubber vibration isolator. The rubber vibration isolator is used for reducing vibration of the noise reduction wall body caused by vibration of the noise reduction device or generated noise.
After the adjacent ventilation and noise reduction wall units are connected, gaps exist between the adjacent wallboards 1 and between the noise reduction units 2, and the gaps can cause acoustic wave coupling between the noise reduction units 2 to influence noise reduction effect; when rainwater or water vapor flows in, the gaps can be sealed by water mist or water, so that the coupling between sound waves is reduced, the noise reduction performance is enhanced, and the noise reduction effect is further enhanced.
The ventilation noise reduction wall provided by the embodiment has higher product performance consistency, and the product quality is easy to control, and can be rapidly applied to noise reduction markets. Meanwhile, through the integral combination and design of the ventilation noise reduction wall body, the full-frequency band noise reduction of 100-1400 Hz frequency multiplication of the transformer can be realized according to the changes of the number, the size parameters and the like of the noise reduction units 2, wherein the 100Hz noise reduction amount is more than 13dB; the noise reduction amount of 200-1400 Hz is more than 20dB.
Example 3:
the embodiment provides a design method of a ventilation and noise reduction wall unit, which comprises the following steps:
according to the noise reduction requirement of the ventilation and noise reduction wall unit, respectively determining the initial sizes of the wallboard 1, the noise reduction unit 2, the sound wave projection port 3 and the sound wave entrance port 4 of the ventilation and noise reduction wall unit;
by utilizing the acoustic simulation method, the design sizes of the wallboard 1, the silencing unit 2, the acoustic wave projection port 3 and the acoustic wave entrance port 4 are determined by iteratively adjusting the initial size based on the noise reduction requirement and the sounding frequency band of the noise reduction device.
The method for simulating the sound wave is used for iteratively adjusting the initial size based on the noise reduction requirement and the sound-producing frequency band of the noise-reduced device to determine the design sizes of the wallboard 1, the silencing unit 2, the sound wave projection port 3 and the sound wave entrance port 4, and comprises the following steps:
firstly, constructing an expansion cavity model based on initial dimensions of a wallboard 1, a silencing unit 2, an acoustic wave projection port 3 and an acoustic wave entrance port 4, and taking the initial dimensions as current dimensions;
determining the acoustic wave energy transmission loss of the expansion cavity model with the current size based on the sounding frequency band of the noise-reduced device by using a transmission loss calculation principle;
thirdly, when the acoustic energy transmission loss of the expansion cavity model meets the noise reduction requirement, the current size parameter is used as a design parameter of the expansion cavity model, and the process is finished;
otherwise, the size parameter is adjusted to serve as the current size, and the second step and the third step are continuously executed until the acoustic wave energy transmission loss of the expansion cavity model meets the noise reduction requirement.
The expansion cavity model is built based on CAD digital model.
As shown in fig. 8, d1 is the equivalent diameter of the circular section corresponding to the area of the acoustic wave projection port 3; d2 is the equivalent diameter of the circular section corresponding to the area of the sound wave entrance port 4
L1 and L3 are the processing thickness of the two side plates; l2 is the actual thickness of the sound attenuating unit 2.
The transmission loss was calculated as follows:
wherein DeltaL is the acoustic energy transmission loss; m is the expansion ratio; k is the wave number of the sound wave in unit time; l is the length of the expansion chamber model, L refers to L2 in this embodiment.
The expansion ratio m is calculated as follows:
wherein D is the equivalent circular cross-sectional diameter corresponding to the cross-sectional area of the silencing unit 2; d1 is the equivalent circular cross-sectional diameter corresponding to the cross-sectional area of the acoustic wave entrance port 4.
The calculation formula of the wave number k of the acoustic wave in unit time is as follows:
wherein f is frequency; c is the sound velocity: 340m/s.
It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The foregoing is illustrative of the present invention and is not to be construed as limiting thereof, but rather as enabling any modification, equivalent replacement, improvement or the like which comes within the spirit and principles of the present invention, are included within the scope of the appended claims.
Claims (17)
1. A ventilation and noise reduction wall unit, which is characterized by comprising a wallboard (1) and a noise reduction unit (2);
the silencing unit (2) comprises a hollow box structure, one side of the box structure is an opening side, and a hole-shaped sound wave projection port (3) is formed in one side, opposite to the opening side, of the box structure;
the wall plate (1) is covered on the opening side of the box structure, and a hole-shaped sound wave entrance opening (4) is formed in the wall plate (1);
the depth direction of the sound wave entrance port (4) and the depth direction of the sound wave projection port (3) are not in the same straight line.
2. A ventilated sound deadening wall unit according to claim 1, characterized in that the sound wave entrance opening (4) has the same or different dimensions as the sound wave entrance opening (3).
3. A ventilated sound deadening wall unit according to claim 1, characterized in that said sound wave projecting port (3) is one or more.
4. A ventilated sound deadening wall unit according to claim 3, characterized in that when said sound wave projecting port (3) is one, the inner side surface of said sound wave projecting port (3) which is far from said sound wave entrance port (4) is coplanar with the inner side surface of said box-packed structure which is close to said sound wave projecting port (3);
when the number of the sound wave projection ports (3) is multiple, the inner side surface of at least one sound wave projection port (3) far away from the sound wave entrance port (4) is coplanar with the inner side surface of the box-packed structure, which is close to the sound wave projection port (3).
5. A ventilating sound deadening wall unit according to claim 1, wherein the sound deadening units (2) are plural, the plural sound deadening units (2) are arranged in an array, and the opening sides are oriented uniformly;
adjacent silencing units (2) are in contact and fixedly connected with each other;
the wallboard (1) covers one end of the openings of the plurality of silencing units (2);
the sound wave entrance ports (4) are multiple, and each silencing unit (2) is arranged corresponding to at least one sound wave entrance port (4).
6. A ventilating sound-deadening wall unit according to claim 5, characterised in that the wall panel (1) is fixedly connected to the sound-deadening unit (2) by means of a mechanical connection.
7. The ventilation and noise reduction wall unit according to claim 6, wherein the side wall of the wall plate (1) facing the noise reduction unit (2) is provided with a clamping groove;
the clamping groove is a rectangular groove;
a plurality of the silencing units (2) form a rectangular array structure;
the opening side of the rectangular array structure is embedded in the rectangular groove, and the peripheral wall of the opening side of the rectangular array structure is clamped with the rectangular groove;
and one side, far away from the sound wave injection port (3), of the clamping groove is provided with the sound wave injection port (4).
8. A ventilating sound-deadening wall unit according to claim 1, wherein the wall plate (1) and the sound-deadening unit (2) are of the same or different materials.
9. A ventilation and noise reduction wall unit according to claim 8, wherein the material comprises a polymeric material or a sheet metal material.
10. The ventilating and silencing wall body is characterized by comprising a plurality of ventilating and silencing wall body units and connecting pieces;
the plurality of ventilation and noise reduction wall units are sequentially connected end to end through the connecting piece and are enclosed to form an annular structure;
the wallboard (1) of the ventilation and noise reduction wall unit is positioned at the inner side of the annular structure;
the silencing unit (2) of the ventilation silencing wall unit is positioned at the outer side of the annular structure;
the noise reducer is arranged in the annular structure.
11. A ventilated sound deadening wall according to claim 10, characterized in that the projection of the sound wave entrance opening (4) of the wall panel (1) in the horizontal direction is located above the sound wave projection opening (3) of the sound deadening unit (2).
12. A ventilated sound deadening wall according to claim 10, further comprising a plurality of vibration isolation devices;
the ventilation and noise reduction wall body is arranged on the ground or the base through the vibration isolation device.
13. A ventilated sound deadening wall according to claim 12, wherein the vibration isolation device is a rubber vibration isolator.
14. A method of designing a ventilation and sound deadening wall unit, comprising:
according to the noise reduction requirement of the ventilation noise reduction wall unit, respectively determining the initial sizes of a wallboard (1), a noise reduction unit (2), an acoustic wave projection port (3) and an acoustic wave entrance port (4) of the ventilation noise reduction wall unit;
and (3) iteratively adjusting the initial size based on the noise reduction requirement and the sounding frequency band of the noise reduction device by using a sound wave simulation method, and determining the design sizes of the wallboard (1), the noise reduction unit (2), the sound wave projection port (3) and the sound wave entrance port (4).
15. The method for designing a ventilation and noise reduction wall unit according to claim 14, wherein the step of determining the design dimensions of the wall board (1), the noise reduction unit (2), the sound wave projecting port (3) and the sound wave incident port (4) by using the sound wave simulation method to iteratively adjust the initial dimensions based on the noise reduction requirement and the sound frequency band of the noise reduction device comprises:
firstly, constructing an expansion cavity model based on initial dimensions of the wallboard (1), the silencing unit (2), the sound wave injection port (3) and the sound wave entrance port (4), and taking the initial dimensions as current dimensions;
determining the acoustic wave energy transmission loss of the expansion cavity model with the current size based on a transmission loss calculation principle based on the sounding frequency band of the noise-reduced device;
thirdly, when the acoustic wave energy transmission loss of the expansion cavity model meets the noise reduction requirement, ending by taking the current size parameter as the design parameter of the expansion cavity model;
otherwise, the size parameter is adjusted to serve as the current size, and the second step and the third step are continuously executed until the acoustic wave energy transmission loss of the expansion cavity model meets the noise reduction requirement.
16. The method for designing a sound deadening wall unit according to claim 15, wherein the expansion chamber model is built based on CAD digital-analog.
17. The method of designing a ventilation and noise reduction wall unit according to claim 15, wherein the transmission loss is calculated as follows:
wherein Δl is the acoustic energy transfer loss; m is the expansion ratio; k is the wave number of the sound wave in unit time; l is the length of the expansion cavity model.
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|---|---|---|---|
| CN202311221302.7A CN117386042A (en) | 2023-09-21 | 2023-09-21 | Ventilating and silencing wall unit, wall and design method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311221302.7A CN117386042A (en) | 2023-09-21 | 2023-09-21 | Ventilating and silencing wall unit, wall and design method |
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| CN117386042A true CN117386042A (en) | 2024-01-12 |
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| CN202311221302.7A Pending CN117386042A (en) | 2023-09-21 | 2023-09-21 | Ventilating and silencing wall unit, wall and design method |
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