CN210606613U - Pre-insulated impedance composite muffler - Google Patents
Pre-insulated impedance composite muffler Download PDFInfo
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- CN210606613U CN210606613U CN201921410846.7U CN201921410846U CN210606613U CN 210606613 U CN210606613 U CN 210606613U CN 201921410846 U CN201921410846 U CN 201921410846U CN 210606613 U CN210606613 U CN 210606613U
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- 238000010521 absorption reaction Methods 0.000 claims abstract description 152
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Abstract
The utility model discloses a pre-insulated impedance composite muffler, which is characterized in that two ends of an outer shell are provided with taper pipes, and the end parts of the taper pipes are provided with connecting flanges; an outer sound absorption layer and an inner sound absorption layer are arranged in the outer shell, and sound absorption materials are arranged in the outer sound absorption layer and the inner sound absorption layer; a sound absorption wall is arranged between the outer sound absorption layer and the outer shell, and an outer perforated plate is arranged between the outer sound absorption layer and the inner sound absorption layer; an inner perforated plate is arranged on the inner surface of the inner sound absorption layer; an outer partition plate is arranged between the outer shell and the inner perforated plate, and an inner partition plate is arranged between the outer perforated plate and the inner perforated plate; the inboard of interior perforated plate is provided with the inoxidizing coating, and the inoxidizing coating forms the sound absorption passageway with taper pipe, flange, and sound absorption passageway is inside to be provided with middle acoustic absorbent. The advantages are compact structure, light weight, small resistance loss, good broadband noise elimination effect, safe and reliable use and convenient installation; has wide application range and certain economic benefit and social effect.
Description
Technical Field
The utility model relates to a field of silencer especially relates to a adiabatic impedance combined type silencer in advance.
Background
The silencer is a basic supporting facility of silencing systems of ships and warships, nuclear power, medical treatment, purification, public meeting and the like. At present, the design and manufacturing capacities of several domestic shaped silencers are still at the past level of sixty and seventy years, and the practical requirements of modern silencing and noise reduction cannot be met. The composite silencer has the advantages of wide application, numerous forms and various structures, and how to design the structure of the composite silencer, so that the silencer has larger broadband silencing capability under the limited space volume, achieves the aims of small resistance loss, light weight and safe and reliable use, and is also the key point of the research in the current silencing field.
In the traditional impedance composite muffler, the low frequency and the overall noise reduction effect are poor, and the noise elimination effect of the medium and low frequencies is improved by increasing the depth of the cavity, so that the space volume of the muffler is large, and the high-frequency noise elimination effect cannot be effectively improved; when the high-frequency silencing effect is improved, the medium-low frequency effect cannot be ensured; the overall silencing effect cannot be improved, and meanwhile, the silencing effect of medium and low frequencies is good, namely the broadband silencing effect is not good; the problem of poor silencing effect of medium and low frequencies is solved by increasing the thickness of the sound absorption layer or increasing the expansion ratio M (M-expansion chamber, namely the ratio of the sectional area of the cavity to the sectional area of the airflow channel), a larger section size is needed, and when the thickness of the sound absorption material is less than or equal to 100mm, the medium and low frequency effects are very unobvious; the adaptability of the using environment is poor, and the application range is small.
Disclosure of Invention
The utility model aims at providing a pre-insulated impedance composite muffler which has compact structure, light weight, small resistance loss, good broadband noise elimination effect, safe and reliable use and convenient installation; the coating is widely applicable to various environments such as heat insulation, fire prevention, corrosion prevention, moisture prevention, salt fog and the like; the technical problem is solved.
In order to realize the technical purpose, reach foretell technical requirement, the utility model discloses the technical scheme who adopts is: a kind of adiabatic impedance hybrid muffler in advance, including the outer casing, its characteristic lies in: two ends of the outer shell are provided with taper pipes, and the end parts of the taper pipes are provided with connecting flanges; an outer sound absorption layer and an inner sound absorption layer are arranged inside the outer shell, and sound absorption materials are arranged in the outer sound absorption layer and the inner sound absorption layer; a sound absorption wall is arranged between the outer sound absorption layer and the outer shell to achieve the effect of pre-heat insulation; an outer perforated plate is arranged between the outer sound absorption layer and the inner sound absorption layer; an inner perforated plate is arranged on the inner surface of the inner sound absorption layer; an outer partition plate is arranged between the outer shell and the inner perforated plate, and an inner partition plate is arranged between the outer perforated plate and the inner perforated plate; the inner side of the inner perforated plate is provided with a protective layer, the taper pipe and the connecting flange form a sound absorption channel, and a middle sound absorption layer is arranged inside the sound absorption channel.
Preferably: the outer partition plate is arranged at the position of 1/3 lengths of the outer shell and divides the outer sound absorption layer and the inner sound absorption layer into two chambers respectively; the inner partition plates are respectively arranged at the positions of 1/4 lengths and 1/2 lengths of the divided inner sound absorption layer to divide the inner sound absorption layer into six chambers.
Preferably: the densities of the sound absorbing materials of the two chambers of the outer sound absorbing layer are 16-24kg/m in a dry-method year; the six chambers of the inner sound absorption layer are filled with sound absorption materials with two densities, wherein the densities of the sound absorption materials of the first chamber, the third chamber, the fourth chamber and the sixth chamber are 32-40kg/m through cultivation, and the densities of the sound absorption materials of the second chamber and the fifth chamber are 16-24kg/m through cultivation.
Preferably: the sound absorption materials in the inner sound absorption layer and the outer sound absorption layer are all made of centrifugal glass wool felt.
Preferably: the perforation rate of the inner perforated plate is 25%, and the perforation rate of the outer perforated plate is 30%.
Preferably: the sound absorption wall is set to be H, a plurality of small holes are uniformly distributed on the inner surface of the sound absorption wall to form a resonance sound elimination body, and the depth of the sound elimination body is set to be 2/3H; the noise elimination body is set to be any one of square, round, triangular and wave-shaped; a through groove is arranged between the longitudinally adjacent noise elimination bodies.
Preferably: the sound absorption wall is made of melamine, polysulfide rubber or butyl rubber, and has good heat insulation effect.
Preferably: the protective layer is made of aluminum silicate sound absorption cloth.
Preferably: the section of the outer shell is circular or rectangular.
The utility model has the advantages that; a pre-adiabatic impedance compound muffler, comparable to conventional structures: the sound absorption layer is divided into an inner sound absorption layer and an outer sound absorption layer by the inner perforated plate and the outer perforated plate, the inner sound absorption layer and the outer sound absorption layer are divided into a plurality of chambers by the outer partition plate and the inner partition plate, sound absorption materials with different densities are filled in the chambers, air vibration caused by sound wave action in the plate holes can be increased, the sound absorption frequency range of resonance frequency is enlarged, the resonance sound absorption coefficient is obviously improved, the sound absorption coefficient is increased, the overall noise elimination level is improved, and the low-frequency noise elimination effect is more obviously improved; the silencer comprises an inner sound absorption layer, an outer sound absorption layer, a sound absorption wall and a protective layer; the sound absorption wall is arranged outside the inner sound absorption layer and the outer sound absorption layer, and plays a role in pre-heat insulation; not only can reduce the depth of the cavity and lead the structure size to be smaller and more compact; meanwhile, the sound absorption frequency range is expanded, the passing frequency of the transmission loss of the reactive muffler is eliminated at the low-frequency part and the middle-high frequency part which are lower than 500HZ, the amplitude of a transmission loss curve is improved, the influence on the middle-high frequency performance is obvious, and the sound absorption frequency range is almost superior to that of the resistive muffler in the whole frequency band; particularly, the noise elimination performance between 500 and 1500HZ is greatly superior to the noise elimination performance of the sound absorption material in the cavity of the noise elimination layer, and the noise elimination frequency band is widened. The utility model has compact structure, light weight, small resistance loss, good broadband noise elimination effect, safe and reliable use and convenient installation; meanwhile, the coating is suitable for being used under the environmental conditions of heat insulation, fire prevention, corrosion prevention, moisture prevention, salt mist and the like, and is more widely applied; has certain economic benefit and social effect.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of the present invention;
fig. 4 is a schematic diagram of the chamber partition of the sound absorption layer of the present invention;
fig. 5 is a schematic view of the sound absorption material filling structure of the present invention;
fig. 6 is a schematic structural view of the sound absorption wall of the present invention;
fig. 7 is a top view of the present invention shown in fig. 6;
in the figure: 1. a taper pipe; 2. an outer housing; 3. a sound absorbing wall; 4. an outer sound absorbing layer; 5. an outer partition plate; 6. an inner sound absorbing layer; 6-1. a first chamber; 6-2. a second chamber; 6-3. a third chamber; 6-4. a fourth chamber; 6-5. a fifth chamber; 6-6. a sixth chamber; 7. an outer perforated plate; 8. an inner perforated plate; 9. a protective layer; 10. an inner partition plate; 11. an intermediate sound absorbing layer; 12. a connecting flange; 13. a sound absorbing channel; 14. a muffler body.
Detailed Description
In order to make the object, technical solution and beneficial technical effects of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments;
in the drawings: a pre-insulated impedance composite muffler comprises an outer shell 2, wherein two ends of the outer shell 2 are provided with conical pipes 1, and the end parts of the conical pipes 1 are provided with connecting flanges 12; an outer sound absorption layer 4 and an inner sound absorption layer 6 are arranged inside the outer shell 2, and sound absorption materials are arranged in the outer sound absorption layer 4 and the inner sound absorption layer 6; a sound absorption wall 3 is arranged between the outer sound absorption layer 4 and the outer shell 2, and an outer perforated plate 7 is arranged between the outer sound absorption layer 4 and the inner sound absorption layer 6; the inner surface of the inner sound absorption layer 6 is provided with an inner perforated plate 8; an outer partition plate 5 is arranged between the outer shell 2 and the inner perforated plate 8, and an inner partition plate 10 is arranged between the outer perforated plate 7 and the inner perforated plate 8; the inner side of the inner perforated plate 8 is provided with a protective layer 9, the taper pipe 1 and the connecting flange 12 form a sound absorption channel 13, and a middle sound absorption layer 11 is arranged inside the sound absorption channel 13.
The outer partition plate 5 is arranged at the position of 1/3 lengths of the outer shell 2 and divides the outer sound absorption layer 4 and the inner sound absorption layer 6 into two chambers respectively; the inner partition plate 10 is provided at the positions corresponding to the 1/4 length and the 1/2 length of the divided inner sound-absorbing layer 6, respectively, and partitions the inner sound-absorbing layer 6 into six chambers. The densities of the sound absorbing materials in the two chambers of the outer sound absorbing layer 4 are 16-24kg/m in a dry method; six chambers of the inner sound absorption layer 6 are filled with sound absorption materials of two densities, wherein the densities of the sound absorption materials of the first chamber 6-1, the third chamber 6-3, the fourth chamber 6-4 and the sixth chamber 6-6 are 32-40kg/m thin film bulk grown by thin film epitaxy, and the densities of the sound absorption materials of the second chamber 6-2 and the fifth chamber 6-5 are 16-24kg/m thin film bulk grown by thin film epitaxy. The sound absorption materials in the inner sound absorption layer 6 and the outer sound absorption layer 4 are both made of centrifugal glass wool felt; the perforation rate of the inner perforated plate 8 is 25 percent, and the perforation rate of the outer perforated plate 7 is 30 percent; the thickness of the sound absorption wall 3 is set to be H, a plurality of small holes are uniformly distributed on the inner surface of the sound absorption wall 3 to form a resonance sound elimination body 14, and the thickness of the sound elimination body 14 is set to be 2/3H; the silencing bodies 14 are arranged in any one of a square shape, a circular shape, a triangular shape and a wave shape, through grooves are arranged between longitudinally adjacent silencing bodies 14, and the width of each through groove is 1/4 of the width of each silencing body; the sound absorption wall 3 is made of melamine, polysulfide rubber or butyl rubber; the protective layer 9 is made of aluminum silicate sound absorption cloth; the section of the outer shell 2 is circular or rectangular.
The utility model discloses a concrete implementation: example 1
The effective length L of the silencer is set to be 1000mm, namely the length L of the outer shell is 1000mm, the inner sound absorption layer and the outer sound absorption layer are simultaneously divided according to the proportion of 1/3 and 2/3, the lengths are respectively L1, L2, L1=2/3L and L2=1/3L, and the divided inner sound absorption layer is divided into six different lengths according to the proportion of 1/2 and 1/4; the lengths of the inner and outer layers of the silencer structure are L3, L4, L5, L6, L7 and L8, L3=1/2L1, L4=1/4L1, L5=1/4L1, L6=1/2L2, L7=1/4L2 and L8=1/4L2, and the passing frequencies are mutually staggered through separation of the inner and outer layers of the silencer structure, so that a wide silencing frequency characteristic can be obtained. Preventing direct transmission of sound waves, the frequencies of different wavelengths can be cut off, and all passing frequencies of odd and even multiples of 1/2 wavelengths can be eliminated respectively. Therefore, a noise elimination characteristic curve without passing frequency is obtained, the effective sound band elimination is greatly improved, and the integral rigidity of the silencer is increased. Compared with the only double-layer resistive muffler, the structure has better medium and low frequency noise elimination effect and overall noise elimination effect.
Because the perforation structure can restrict the medium-high frequency performance of the sound absorption material, the influence can be reduced by increasing the perforation rate of the outer layer, and the overall noise elimination index is ensured. The increase of the perforation rate has little influence on low frequency, the middle and high frequency transmission loss curve is deviated, and the peak value of the transmission loss and the resonance frequency are simultaneously increased due to the high perforation rate. The silencer has the advantages that the inner layer perforation rate is 25%, and the outer layer perforation rate is 30%.
Carrying out 16-24kg/m high-speed harvest on the sound absorption materials of the two chambers of the outer sound absorption layer; the six chambers of the inner sound absorption layer are filled with sound absorption materials with two densities, wherein the densities of the sound absorption materials of the first chamber, the third chamber, the fourth chamber and the sixth chamber are 32-40kg/m through cultivation, and the densities of the sound absorption materials of the second chamber and the fifth chamber are 16-24kg/m through cultivation. The noise elimination performance of the silencer in partial frequency bands is improved, the overall noise elimination effect is improved, the noise elimination frequency band of the silencer is widened, and meanwhile, the density of the sound absorption material on the inner layer is larger than that of the sound absorption material on the outer layer, and the overall noise elimination effect is higher. The transmission loss increases with the flow resistance (density of the sound absorbing material), the resonance peak tends to be flat, and the passing frequency gradually disappears; the flow resistance is increased, and the medium-high frequency performance of the silencer is greatly improved.
The noise elimination wall is made of an ultra-light, fireproof and heat-insulating melamine sound absorption material, and the material is composed of a high three-dimensional net-shaped cross-linked structure system, so that the noise elimination wall has good thermal stability and aging resistance, can be used at the temperature of-180 ℃ for a long time, is nontoxic, tasteless, sanitary and environment-friendly, has a small thermal conductivity coefficient (insulation ratio), and has good heat insulation and heat preservation effects, and therefore, the noise elimination wall is a good heat insulation material. The sound absorption wall material also plays a role in absorbing vibration due to light weight and certain elasticity; the process of absorbing vibration is an energy consuming process, as well as a sound absorbing process. The thickness of the sound absorption wall is 9-18mm, and the sound absorption wall has large surface density, can isolate internal noise from radiating outwards, is equivalent to wrap a layer of cotton quilt, obviously weakens sound, and inhibits the internal noise from radiating outwards; the overall silencing effect is greatly improved.
The sound absorption holes on the surface of the sound absorption wall are resistance units added for improving the low-frequency sound absorption amount of the silencer, and the depth of the sound absorption holes is 6-12 mm. A simple method for improving the low frequency of a silencer is to place an air interlayer between a sound absorption material and a rigid wall surface, wherein the air interlayer on the back of the sound absorption material is equivalent to a resonance sound absorption structure, so that the waveform of passing sound waves is changed, the sound energy is converted into heat energy to be consumed, the energy of the refracted sound waves is greatly reduced, the partial frequency of the passing sound waves is sharply reduced, and the low-frequency sound absorption characteristic of the sound absorption material can be obviously improved. The structure of the sound absorption wall can fully utilize the space of the silencer, so that the contact area of the airflow and the sound absorption material is increased, and the medium-high frequency sound absorption quantity of the silencer is effectively improved; if the sound absorption wall is too thick, the design space of the internal structure is reduced, and the performance of the muffler cannot be fully exerted.
The silencer is connected to the enlarged internal sound absorption channel through connecting taper pipes at two ends; if the section of the internal channel changes, the internal channel is isolated by riveting and installing a middle sound absorption sheet with thickness, so that the internal channel is divided into narrow channel sections which are more favorable for improving the noise elimination amount; because a plurality of resistance elements are added in the impedance composite muffler, the resistance loss of the muffler is increased and regenerative (secondary) airflow noise is generated; because the air flow changes the attenuation rule in the silencer, the sound wave propagation condition can be changed due to the existence of the air flow. At the moment, the method of changing the channel section is adopted, the area of the air channel is properly increased, the air speed can be effectively reduced, the internal air flow is stabilized, the resistance loss is reduced, and the generation of air flow noise is effectively avoided. Due to the increase of the channel area, namely the sound absorption area is correspondingly increased, the main positive effect on improving the overall noise elimination effect is achieved; the best muffling effect can be achieved by using a muffler, the channel cross-section of which is adapted to the wind speed.
The protective layer adopts aluminum silicate sound absorption cloth which can resist the high temperature of 1260 ℃ at most, and the net structure of the protective layer has the functions of heat insulation and sound absorption; the environment and the application occasion are wider; the blowing erosion of the internal sound absorption material when the wind speed is overlarge is effectively prevented; prevent damage to the internal structure in case of safety failure (fire accident).
Under the condition of limited space, the total noise elimination quantity of the silencer is more than or equal to 40dB, and the medium-frequency and low-frequency noise elimination effects are considered; the noise elimination amount reaches 30dB under 500HZ, and reaches 40dB under 1000 HZ.
The foregoing examples are given for the purpose of illustrating the present invention in a clear and non-restrictive manner, and it will be apparent to those skilled in the art that variations and modifications of the present invention may be made in other variations and modifications based on the foregoing description, and it is not necessary or necessary to exhaustively enumerate all embodiments, and all such variations and modifications as are obvious and desirable in the art are within the scope of the present invention.
Claims (9)
1. A pre-adiabatic impedance compound muffler including an outer shell (2), characterized in that: two ends of the outer shell (2) are provided with conical pipes (1), and the end parts of the conical pipes (1) are provided with connecting flanges (12); an outer sound absorption layer (4) and an inner sound absorption layer (6) are arranged inside the outer shell (2), and sound absorption materials are arranged in the outer sound absorption layer (4) and the inner sound absorption layer (6); a sound absorption wall (3) is arranged between the outer sound absorption layer (4) and the outer shell (2), and an outer perforated plate (7) is arranged between the outer sound absorption layer (4) and the inner sound absorption layer (6); an inner perforated plate (8) is arranged on the inner surface of the inner sound absorption layer (6); an outer partition plate (5) is arranged between the outer shell (2) and the inner perforated plate (8), and an inner partition plate (10) is arranged between the outer perforated plate (7) and the inner perforated plate (8); the inner side of the inner perforated plate (8) is provided with a protective layer (9), the taper pipe (1) and the connecting flange (12) form a sound absorption channel (13), and a middle sound absorption layer (11) is arranged inside the sound absorption channel (13).
2. The pre-insulated impedance compound muffler of claim 1, wherein: the outer partition plate (5) is arranged at the position of 1/3 lengths of the outer shell (2) and divides the outer sound absorption layer (4) and the inner sound absorption layer (6) into two chambers respectively; the inner partition plate (10) is respectively arranged at the positions of 1/4 length and 1/2 length of the divided inner sound absorption layer (6) to divide the inner sound absorption layer (6) into six chambers.
3. The pre-insulated impedance compound muffler of claim 2, wherein: carrying out thin film extrusion on the sound absorbing materials in the two chambers of the outer sound absorbing layer (4) according to a high-density thin film extrusion method, wherein the density of the sound absorbing materials in the two chambers of the outer sound absorbing layer (4) is 16-24 kg/m; six chambers of the inner sound absorption layer (6) are filled with sound absorption materials with two densities, wherein the densities of the sound absorption materials of the first chamber (6-1), the third chamber (6-3), the fourth chamber (6-4) and the sixth chamber (6-6) are 32-40kg/m for thin film epitaxy, and the densities of the sound absorption materials of the second chamber (6-2) and the fifth chamber (6-5) are 16-24kg/m for thin film epitaxy.
4. The pre-adiabatic impedance compound muffler of claim 1, 2 or 3, wherein: the sound absorption materials in the inner sound absorption layer (6) and the outer sound absorption layer (4) are all made of centrifugal glass wool felt.
5. The pre-insulated impedance compound muffler of claim 1, wherein: the perforation rate of the inner perforated plate (8) is 25%, and the perforation rate of the outer perforated plate (7) is 30%.
6. The pre-insulated impedance compound muffler of claim 1, wherein: the thickness of the sound absorption wall (3) is set to be H, and a plurality of small holes are uniformly distributed on the inner surface of the sound absorption wall (3) to form a resonance sound elimination body (14); the depth of the sound attenuation body (14) is set to 2/3H; the silencing bodies (14) are set to be any one of square, round, triangular and wave-shaped, and a through groove is formed between every two longitudinally adjacent silencing bodies.
7. The pre-insulated impedance compound muffler of claim 6, wherein: the sound absorption wall (3) is made of melamine, polysulfide rubber or butyl rubber.
8. The pre-insulated impedance compound muffler of claim 1, wherein: the protective layer (9) is made of aluminum silicate sound absorption cloth.
9. The pre-insulated impedance compound muffler of claim 1, wherein: the section of the outer shell (2) is circular or rectangular.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921410846.7U CN210606613U (en) | 2019-08-28 | 2019-08-28 | Pre-insulated impedance composite muffler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921410846.7U CN210606613U (en) | 2019-08-28 | 2019-08-28 | Pre-insulated impedance composite muffler |
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| CN210606613U true CN210606613U (en) | 2020-05-22 |
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| CN201921410846.7U Withdrawn - After Issue CN210606613U (en) | 2019-08-28 | 2019-08-28 | Pre-insulated impedance composite muffler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110428800A (en) * | 2019-08-28 | 2019-11-08 | 宝钢空调（泰州）有限公司 | A kind of pre- insulation impedance composite muffler |
| US20230064984A1 (en) * | 2021-08-27 | 2023-03-02 | Dimension Product Solutions LP | Noise suppression unit |
-
2019
- 2019-08-28 CN CN201921410846.7U patent/CN210606613U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110428800A (en) * | 2019-08-28 | 2019-11-08 | 宝钢空调（泰州）有限公司 | A kind of pre- insulation impedance composite muffler |
| CN110428800B (en) * | 2019-08-28 | 2024-08-09 | 宝钢空调（泰州）有限公司 | Pre-heat-insulation impedance composite muffler |
| US20230064984A1 (en) * | 2021-08-27 | 2023-03-02 | Dimension Product Solutions LP | Noise suppression unit |
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