Rear cavity reflection amplification and impedance composite sheet type silencer structure
By using a plate-type muffler structure with rear cavity reflection amplification and impedance composite, the muffler channel is divided into independent small channels and sound-absorbing structures are set in the small channels. This solves the problems of insufficient low frequency and high frequency failure of existing mufflers, and achieves the silencing effect of low frequency enhancement and high frequency optimization, while reducing cost and voltage drop loss.
Patent Information
- Application Number
- CN202423270300.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2034-12-30
AI Technical Summary
Existing mufflers have insufficient low-frequency noise reduction and are prone to failure at high frequencies. Increasing the thickness of the muffler plate to improve low-frequency noise reduction increases the size of the muffler and the risk of high-frequency failure, while also increasing noise reduction costs and voltage drop losses.
The silencer adopts a plate-type silencer structure with rear cavity reflection amplification and impedance composite. By installing low-frequency amplification silencer plates and reflection auxiliary silencer plates alternately, the silencer channel is divided into independent isolation channels. A rear cavity with sound-absorbing structure is set in the small channel. The cavity between the reflection auxiliary silencer plate and the low-frequency amplification silencer plate is used to increase the loss of low-frequency noise sound energy. The spacing of the components is adjusted to form a continuous resonant cavity, thereby achieving the reactive noise reduction function.
While increasing the low-frequency noise reduction, the high-frequency noise reduction effect is optimized to avoid high-frequency failure, reduce the channel spacing, reduce the thickness of the reflective auxiliary noise reduction sheet, take into account the low-frequency and mid-high frequency noise reduction, and reduce cost and voltage drop loss.
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Figure CN223956294U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a slice muffler technical field especially relates to a slice muffler structure of back cavity reflection amplification, impedance composite. BACKGROUND
[0002] Device noise can affect the surrounding people or things through structure sound transmission and air sound transmission. For air transmission, especially pipeline air, the main noise reduction means is to install a muffler for noise reduction, and the use of a slice muffler is the most common.
[0003] The existing muffler has the following problems when in use:
[0004] The existing muffler has the following problems when in use: The utility model discloses a slice muffler structure of back cavity reflection amplification, impedance composite.
[0005] The utility model discloses a slice muffler structure of back cavity reflection amplification, impedance composite.
[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:
[0007] The application discloses a back cavity reflection amplification and impedance composite sheet muffler structure which comprises a muffler main body which is composed of a muffler outer plate, a plurality of low-frequency amplification muffling sheets and two reflection auxiliary muffling sheets, wherein the plurality of low-frequency amplification muffling sheets and the two reflection auxiliary muffling sheets are arranged on the inner wall of the muffler outer plate in a staggered manner.
[0008] In a possible design, the material of the first perforated outer plate and the second perforated outer plate is one of a metal perforated plate, other inorganic or organic material perforated plate.
[0009] In a possible design, the material of the first muffling sheet resistance frame and the second muffling sheet resistance frame is one of a steel plate, a light steel keel and other organic or inorganic plate.
[0010] In a possible design, the material of the second porous sound-absorbing material, the first porous sound-absorbing material and the third porous sound-absorbing material is one of rock wool or glass wool.
[0011] In a possible design, the material of the middle low-frequency sound-absorbing component is one of a metal perforated plate, a micro-perforated plate, a thin glass wool plate with large density, a ceramic micro-porous plate or a slit sound-absorbing plate.
[0012] In a possible design, the material of the middle sound insulation component is one of a metal sound insulation plate or other inorganic and organic sound insulation plate.
[0013] In the application, the low-frequency amplification muffling sheet and the reflection auxiliary muffling sheet are installed alternately (interleaved with each other), and the spacing between the two is determined according to the actual use, the entire muffling channel is divided into independent isolated small channels by the low-frequency amplification muffling sheet and the reflection auxiliary muffling sheet, the sound wave reflection frequency is increased, and the muffling amount of the muffler is increased, in the isolated small channel, the cavity between the sound insulation plate of the reflection auxiliary muffling sheet and the low-frequency sound absorption component of the low-frequency amplification muffling sheet becomes the rear cavity of the sound absorption structure, the sound energy loss of low-frequency noise can be increased, the overall low-frequency muffling amount is increased, the spacing of the low-frequency amplification muffling sheet and the reflection auxiliary muffling sheet is adjusted, so that continuous resonance cavities with different lengths are formed when the low-frequency amplification muffling sheet and the reflection auxiliary muffling sheet are installed alternately, the entire channel is divided into contraction and expansion cavities with different distances, certain resistance muffling function is realized, and the overall muffling amount of the muffler is increased; when the noise reduction target is low frequency, the thickness of the low-frequency amplification muffling sheet can be increased, and the thickness of the reflection auxiliary muffling sheet is reduced, the low-frequency noise reduction amount is increased, the medium-frequency muffling amount is ensured, and the high-frequency failure frequency is prevented from being too low, wherein the top ends of the first perforated outer plate and the second perforated outer plate can be made into semicircles, ellipses, triangles and various shapes.
[0014] The beneficial effects in the utility model are as follows:
[0015] In the utility model, the back cavity reflection amplification and impedance composite sheet type muffler structure, through low-frequency amplification muffling sheet and reflection auxiliary muffling sheet alternate installation, divide the big muffler channel into each closed isolated small channel, be favorable to low-frequency muffling, when low-frequency noise passes through the surface perforated plate of low-frequency amplification muffling sheet and the low-frequency sound absorption component at the middle position, realize twice sound energy loss.
[0016] In the utility model, the back cavity reflection amplification and impedance composite sheet type muffler structure, through in isolated small channel, the cavity between the sound insulation plate of reflection auxiliary muffling sheet and the low-frequency sound absorption component of low-frequency amplification muffling sheet becomes the rear cavity of sound absorption structure, can increase the sound energy loss of low-frequency noise, increase low-frequency overall muffling amount, in isolated small channel, utilize the strengthening dragon frame of muffling sheet, divide the entire channel into contraction and expansion cavities with different distances, realize certain resistance muffling function, increase the overall muffling amount of muffler, under the same ventilation rate, by reducing the thickness of reflection auxiliary muffling sheet, increase the thickness of low-frequency amplification muffling sheet, can reduce the spacing of muffling channel, optimize high-frequency failure problem, while taking into account low-frequency and medium-high frequency muffling amount.
[0017] The utility model discloses a kind of low-frequency amplification muffler piece and reflection auxiliary muffler piece, which divide the entire sound-absorbing channel into independent isolated small channels, increase sound wave reflection frequency, increase the sound-absorbing amount of muffler, in the isolated small channel, the cavity between the sound insulation board of reflection auxiliary muffler piece and the low-frequency sound-absorbing component of low-frequency amplification muffler piece becomes the rear cavity of sound-absorbing structure, which can increase the sound energy loss of low-frequency noise and increase the overall sound-absorbing amount of low-frequency. BRIEF DESCRIPTION OF DRAWINGS
[0018] Fig. 1 A front view structural schematic diagram of a piece-type muffler structure with rear cavity reflection amplification and impedance combination is provided in the utility model.
[0019] Fig. 2 A low-frequency amplification muffler piece and reflection auxiliary muffler piece sectional view structural schematic diagram of a piece-type muffler structure with rear cavity reflection amplification and impedance combination is provided in the utility model.
[0020] Fig. 3 A low-frequency amplification muffler piece sectional view structural schematic diagram of a piece-type muffler structure with rear cavity reflection amplification and impedance combination is provided in the utility model.
[0021] Fig. 4 A reflection auxiliary muffler piece sectional view structural schematic diagram of a piece-type muffler structure with rear cavity reflection amplification and impedance combination is provided in the utility model.
[0022] Fig. 5 A single-channel sound-absorbing amplification principle diagram of a piece-type muffler structure with rear cavity reflection amplification and impedance combination is provided in the utility model.
[0023] Fig. 6 A resistance composite sound-absorbing amplification principle diagram of a piece-type muffler structure with rear cavity reflection amplification and impedance combination is provided in the utility model.
[0024] In the figure: 1, muffler outer plate; 2, low-frequency amplification muffler piece; 3, reflection auxiliary muffler piece; 21, middle low-frequency sound-absorbing component; 22, second porous sound-absorbing material; 23, first perforated outer plate; 24, first sound-absorbing piece resistance frame; 31, middle sound insulation component; 32, third porous sound-absorbing material; 33, second perforated outer plate; 34, second sound-absorbing piece resistance frame. DETAILED DESCRIPTION
[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. EMBODIMENT
[0026] WITH REFERENCE Figs. 1-6 A rear cavity reflection amplification and impedance composite sheet type muffler structure is applied in the field of sheet type mufflers, which comprises: a muffler body mainly composed of a muffler outer plate 1, a plurality of low-frequency amplification muffling sheets 2 and two reflection auxiliary muffling sheets 3. These components cooperate together to achieve high-efficiency muffling effect. The muffler outer plate 1 adopts a double-layer structure and is composed of a metal plate and a porous sound-absorbing material. The metal plate is a hollow structure inside to increase its rigidity and sound insulation effect. A plurality of through holes are arranged on the inner wall of the metal plate, which allow sound waves to penetrate and enter the porous sound-absorbing material inside the muffler, thereby being effectively absorbed. The plurality of low-frequency amplification muffling sheets 2 and the two reflection auxiliary muffling sheets 3 are all installed on the inner wall of the muffler outer plate 1 and are arranged in a staggered manner. This layout helps to optimize the propagation path of sound waves and improve the muffling effect.
[0027] The low-frequency amplification muffling sheet 2 is composed of a first perforated outer plate 23, a first muffling sheet resistance frame 24, a second porous sound-absorbing material 22 and a middle low-frequency sound-absorbing component 21. The first perforated outer plate 23 is concave and is made of a metal perforated plate or other inorganic or organic perforated plate. This perforated plate has excellent air permeability and acoustic performance and can allow sound waves to penetrate and interact with the sound-absorbing material inside.
[0028] The first muffling sheet resistance frame 24 is installed in the first perforated outer plate 23 and is used to support and fix other components. It is made of a steel plate, a light steel keel or other organic or inorganic plate material and has good rigidity and stability. The second porous sound-absorbing material 22 is filled in the first perforated outer plate 23 and is located between the first muffling sheet resistance frame 24 and the middle low-frequency sound-absorbing component 21. This sound-absorbing material is made of high-efficiency sound-absorbing materials such as rock wool or glass wool and can effectively absorb sound wave energy.
[0029] The middle low-frequency sound-absorbing component 21 is made of one of a metal perforated plate, a micro-perforated plate, a thin glass wool plate with high density, a ceramic micro-porous plate or a slit sound-absorbing plate. It is located above or below the second porous sound-absorbing material 22 depending on the design and is used to further enhance the absorption effect of low-frequency sound waves.
[0030] The reflection auxiliary sound-absorbing sheet 3 is composed of a second perforated outer plate 33, a second sound-absorbing sheet resistant frame 34, a third porous sound-absorbing material 32 and a middle sound-insulating member 31. The second perforated outer plate 33 is also concave and made of the same material as the first perforated outer plate 23. It allows sound waves to penetrate and enter the sound-absorbing material inside. The second sound-absorbing sheet resistant frame 34 is installed inside the second perforated outer plate 33 for supporting and fixing other components. It is made of the same material as the first sound-absorbing sheet resistant frame 24. The third porous sound-absorbing material 32 is filled inside the second perforated outer plate 33 and located between the second sound-absorbing sheet resistant frame 34 and the middle sound-insulating member 31. This sound-absorbing material is the same as the second porous sound-absorbing material 22 and has good sound-absorbing performance. Embodiment
[0031] Reference Figs. 1-4 On the basis of Embodiment One, improvements are made:
[0032] The middle sound-insulating member 31 is made of a metal sound-insulating plate or other inorganic or organic sound-insulating plate. It is located above or below the third porous sound-absorbing material 32, depending on the design, for blocking and reflecting sound waves to reduce the propagation of noise.
[0033] The above description is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or changes within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.
Claims
1. A sheet type muffler structure of a back cavity reflection amplification, impedance complex, characterized by, The muffler body is composed of a muffler outer plate (1), a plurality of low-frequency amplification muffling sheets (2) and two reflection auxiliary muffling sheets (3), the plurality of low-frequency amplification muffling sheets (2) and the two reflection auxiliary muffling sheets (3) are installed on the inner wall of the muffler outer plate (1) and are arranged in a staggered manner, the muffler outer plate (1) is composed of a metal plate and a porous sound-absorbing material, the metal plate is a hollow structure, the first porous sound-absorbing material is filled in the metal plate, and a plurality of through holes are formed in the inner wall of the metal plate, the low-frequency amplification muffling sheet (2) is composed of a first perforated outer plate (23), a first muffling sheet resistance frame (24), a second porous sound-absorbing material (22) and a middle low-frequency sound-absorbing component (21), the first perforated outer plate (23) is concave, the first muffling sheet resistance frame (24) and the middle low-frequency sound-absorbing component (21) are installed in the first perforated outer plate (23), the second porous sound-absorbing material (22) is filled in the first perforated outer plate (23) and located between the first muffling sheet resistance frame (24) and the middle low-frequency sound-absorbing component (21), the reflection auxiliary muffling sheet (3) is composed of a second perforated outer plate (33), a second muffling sheet resistance frame (34), a third porous sound-absorbing material (32) and a middle sound insulation component (31), the second perforated outer plate (33) is concave, the second muffling sheet resistance frame (34) and the middle sound insulation component (31) are installed in the second perforated outer plate (33), and the third porous sound-absorbing material (32) is filled in the second perforated outer plate (33) and located between the second muffling sheet resistance frame (34) and the middle sound insulation component (31).
2. A structure of a patch type muffler of a rear cavity reflection amplification, impedance complexing according to claim 1, characterized by, The material of the first perforated outer plate (23) and the second perforated outer plate (33) is one of a metal perforated plate, other inorganic or organic material perforated plate.
3. The construction of a reactive impedance-combined sheet silencer with a rear cavity reflection amplification according to claim 1, characterized in that, The material of the second porous sound-absorbing material (22), the first porous sound-absorbing material and the third porous sound-absorbing material (32) is one of rock wool or glass wool.
4. The construction of a reactive impedance-combined sheet silencer with a rear cavity reflection amplification according to claim 1, characterized in that, The material of the middle low-frequency sound-absorbing component (21) is one of a metal perforated plate, a micro-perforated plate, a thin glass wool plate with high density, a ceramic micro-porous plate or a slit sound-absorbing plate.