CN212457555U - Device capable of shortening incident noise wavelength of silencer - Google Patents
Device capable of shortening incident noise wavelength of silencer Download PDFInfo
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- CN212457555U CN212457555U CN202020911512.4U CN202020911512U CN212457555U CN 212457555 U CN212457555 U CN 212457555U CN 202020911512 U CN202020911512 U CN 202020911512U CN 212457555 U CN212457555 U CN 212457555U
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Abstract
A device which has a simple structure and can shorten the wavelength of incident noise of a silencer by reducing the temperature of air flow to increase the noise reduction amount of the silencer. The inlet end of the air flow of the silencer is provided with a cooling device which can cool the temperature of the incident air flow and then shorten the wavelength of the incident noise, and the incident air flow passes through the cooling device and enters the silencer. The temperature of the incident air flow is reduced, so that the wave length of the incident noise transmitted into the silencer along with the incident air flow is shortened, the penetrating power of the incident noise is greatly reduced, the incident noise is effectively prevented from being transmitted into the environment through the shell wall of the silencer to cause secondary sound pollution, and the incident noise can be better absorbed by a sound absorption material arranged in the silencer due to the shortened wave length of the incident noise, so that the noise reduction amount of the silencer is improved in a phase-changing manner. The two cooling devices are respectively a water spray atomizer and a heat exchanger and are selected according to the temperature of incident airflow.
Description
Technical Field
The utility model relates to a large-scale silencer, in particular to through reducing incident airflow temperature so that the heat sink of incident noise wavelength shortening.
Background
The most basic performance evaluation indexes of the silencer are as follows: insertion loss (sound transmission loss) is colloquially referred to as "noise reduction amount". The silencer mainly plays a role in silencing and reducing noise, and the performance is better when the performance parameter is larger.
In the noise reduction process of the silencer in the prior art, noise emitted by a noise source enters the silencer along with air flow, wherein part of the noise is absorbed by a sound absorption material in the silencer, and the other part of the noise passes through the wall of the silencer shell or enters ambient air from the air flow discharge end of the silencer to continuously pollute the environment.
In order to increase the noise reduction, the prior art mostly adopts the improvement of the number or the arrangement of sound absorbers in the silencer, but the improvement idea may increase the airflow resistance of the silencer and influence other technical parameters of the silencer.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a simple structure, improve the device that can make silencer incident noise wavelength shorten of the volume of making an uproar of falling of silencer through reducing the air current temperature.
In order to solve the technical problem, the utility model discloses a technical scheme be:
the utility model discloses a can make device that silencer incident noise wavelength shortened, its characterized in that: the temperature reducing device capable of reducing the temperature of incident airflow and shortening the wavelength of incident noise is arranged at the airflow inlet end of the silencer, and the incident airflow penetrates through the temperature reducing device and enters the array silencer.
The cooling device adopts a water mist cooling structure.
The water mist cooling structure is composed of a shell, a water supply pipe, grid type airflow channels and water mist nozzles, wherein the shell is cylindrical, the inner end of the shell is connected with the shell of the silencer into a whole, a plurality of partition plates extending along the direction of a cylinder shaft are arranged in the shell, all the partition plates form a plurality of grid type airflow channels through cross arrangement, one nozzle capable of atomizing water is arranged in each grid type airflow channel, and the water supply pipe penetrates through the shell to extend into the cylinder and is communicated with all the nozzles.
The section shape of the shell is the same as that of the silencer shell, and the section shape of the grid type airflow channel is a quadrangle, a circle, a fan or a figure formed by intersection of two concentric circles and the fan.
The thickness of the partition board is 2mm-5mm, and the length of the partition board is 200mm-1000 mm.
The cooling device is a heat exchanger with fins, the heat exchanger is fixedly connected in a hollow shell with two open ends, and the incident airflow enters the silencer from gaps among the fins.
A temperature sensor is arranged between the airflow inlet end of the silencer and the cooling device.
The shell is made of stainless steel, titanium or carbon galvanized steel and the length of the shell is 350-1150 mm.
The distance between two adjacent spray heads is 100-400 mm.
The utility model discloses set up the device that can cool down to this incident air current temperature at the air current entry end of silencer, through the temperature that reduces the incident air current, make the sound wave wavelength along with incident air current propagation to the incident noise in the silencer also shorten along with it, greatly reduced the penetrability of incident noise, thereby effectively avoid this incident noise to pass the shell conch wall of silencer and propagate to cause secondary sound pollution in the environment, because the wavelength of incident noise shortens, it can be set up the better absorption of sound absorbing material in the silencer, consequently also the improvement of looks of changing the volume of making an uproar that falls of this silencer. The utility model discloses a two kinds of heat sink are water spray atomization and heat exchanger respectively, select above-mentioned two kinds of heat sink according to the height of the temperature of incident air current.
Drawings
FIG. 1 is a schematic sectional view of a vertical muffler adopting a water mist cooling structure.
Fig. 2 is a schematic sectional view of a vertical muffler adopting a heat exchanger cooling structure.
Fig. 3 is a schematic sectional view of a water mist cooling structure adopted on the horizontal muffler.
Fig. 4 is a schematic plan view of several water mist cooling structures with different spray head layouts.
Fig. 5 is a schematic cross-sectional structure of several muffling segments.
The reference numbers are as follows:
the device comprises a silencer 1, a shell 11, a sound absorber or sound absorption layer 12, a temperature reduction device 2, a water mist temperature reduction structure 3, a water supply pipe 31, an air flow channel 32, a nozzle 33, a partition plate 34, a heat exchanger 4, a refrigerant circulating pipe 41, fins 42, a temperature sensor 5 and a shell 6.
Detailed Description
The utility model discloses a can make the device that silencer incident noise wavelength shortened install at the air entry end of silencer 1, it can be with the silencer among the prior art for the isolating construction (isolating construction's benefit is to produce respectively, transport, reassembles after arriving the scene), also can be an overall structure with its and current silencer design (its benefit is, noise elimination stable performance), the utility model discloses preferred the latter.
The silencer 1 with the device of the utility model can be arranged vertically or horizontally (see fig. 1-3), and can be basically large-scale silencer, and is used for being arranged in places with high noise such as city subway underground engineering, mine deep well, tunnel and large-scale central air conditioning unit. The types of mufflers involved may be of the square cross-sectional shape, the plate type, the array type, the honeycomb type, the return type, the circular pipe type, the circular core type, the plate type and the cross core type (see fig. 5).
The muffler 1 is composed mainly of an outer shell 11 and a sound absorber or sound absorbing layer 12 disposed inside the outer shell 11.
The noise entering the muffler 1 with the air flow is hereinafter referred to as incident noise.
The utility model discloses a can make heat sink 2 that adopts in the device that 1 incident noise wavelength of silencer shortened be following two kinds:
1. water mist cooling structure 3
Consists of a shell 6, a water supply pipe 31, a grid type airflow channel 32 and a water mist spray head 33.
1) Housing 6
The section profile wheel follows the shape of the shell 11 of the muffling segment and is connected with the shell 11 of the muffling segment into a whole.
The shell 6 is made of stainless steel, titanium material or carbon galvanized steel plate, the thickness of the shell is consistent with that of the shell 11 of the muffling segment, and the length is preferably 350mm-1150 mm. Mainly provides an internal space for installing the water supply pipe 31, the grid type airflow channel 32 and the water mist spray head 33 and provides a space environment for cooling incident airflow, thereby better achieving the cooling effect.
2) Water supply pipe 31
Preferably, stainless steel pipes are selected, the caliber of a main pipe of each water pipe is preferably DN25-DN50mm, the caliber of a branch pipe is preferably DN8-DN25mm, the caliber of the branch pipe is consistent with the caliber of the spray head 33, the wall thickness of the water pipe is 2-3mm, the water pipe penetrates through the shell 6, the water pipes are reasonably arranged according to the distribution of the spray head 33, and the water pipes mainly play a role in supplying water for the spray head 33.
3) Grille-type airflow passage 32
The structure is characterized in that a plurality of criss-cross partition plates 34 are arranged in a shell 6, a plurality of airflow channels 32 are arranged in the shell 6, each airflow channel 32 is formed by four partition plates 34 in a surrounding mode, the partition plates 34 extend from an inlet end to an outlet end of the shell 6, the length of each partition plate is 200mm-1000mm, the thickness of each partition plate 34 is 2mm-5mm, and each partition plate is made of stainless steel, copper or carbon galvanized steel plates.
In each air flow channel 32, a spray head 33 for atomizing water is arranged, the spray head 33 preferably being arranged in the center of the air flow channel 32 and close to the outer end of the housing 6, the water outlet direction of the spray head 33 being directed towards the muffler 1. The water supply pipe 31 passes through the housing 6 to communicate with the corresponding shower head 33 through the branched water supply pipe 31.
The incident airflow passes through the long and narrow airflow channel 32, and can be contacted with the water mist to exchange heat more fully, so that the cooling effect is improved, and meanwhile, the wavelength of the incident noise synchronously passing through the airflow channel 32 along with the incident airflow is shortened under the condition that the ambient temperature in the airflow channel 32 is reduced.
The cross-sectional shape of the gas flow passage 32 is a quadrangle, a circle, a fan, or a figure formed by the intersection of two concentric circles and a fan (see fig. 4).
4) Water mist head 33
The spray heads 33 are made of stainless steel, copper or carbon galvanized steel plates, can be solid cone spray heads, spiral spray heads, hollow cone spray heads and the like, the caliber is preferably DN8-DN25mm, the spray grain diameter is preferably 50-500 mu m, the spray angle is 60-150 ℃, and the distance between two adjacent spray heads 33 is 100-400 mm.
The arrangement of all the spray heads 33 is adjusted adaptively according to the sectional shape of the casing 6, as shown in fig. 4, which is a diagram of several arrangement structures.
5) Temperature sensor 5
In order to know the temperature of the incident airflow to be cooled down in time, a temperature sensor 5 is arranged between the airflow inlet end of the silencer 1 and the cooling device 2. And the temperature of the air flow after the water spraying and cooling is monitored in real time so as to ensure that the purpose of cooling is achieved.
The water mist cooling structure 3 is more suitable for the condition that the temperature of the incident airflow is higher than 100 ℃, and the generated water mist is easy to evaporate at the temperature, so that a better heat exchange effect can be achieved.
2. Finned heat exchanger 4
The heat exchanger is fixedly connected in a shell 6 with two open ends and a hollow end, the shape of the section of the shell 6 is the same as that of the section of the silencer 1, and the shell 6 is fixedly connected with a shell 11 of the silencer 1, and a separated structure or an integrated structure can be arranged between the shell 6 and the shell.
The heat exchanger 4 is a heat exchanger with fins 42, and the refrigerant circulation pipe 41 in the heat exchanger 4 may be a corrosion-resistant metal pipe such as a steel pipe, a stainless steel pipe, or a copper pipe.
The fins 42 may also be made of steel, stainless steel, copper or aluminum strips. The heat exchanger 4 is filled with low-temperature liquid to absorb heat so as to reduce the inlet air temperature of the silencer 1.
The fins 42 run parallel to the axis of the housing 6, i.e. the incident airflow can pass through the gaps between adjacent fins 42, thus effectively reducing the temperature of the incident airflow.
Also, a temperature sensor 5 is provided between the heat exchanger 4 and the airflow inlet end of the muffler 1.
The heat exchanger 4 with the fins 42 is suitable for use when the incident airflow is at normal temperature and normal pressure.
3. Principle of shortening incident noise wavelength by reducing air flow temperature
The longer the acoustic wave wavelength of the incident noise is, the stronger the incident acoustic wave penetrating power is, and the lower the noise reduction amount of the muffler is, whereas the shorter the acoustic wave wavelength of the incident noise is, the weaker the incident acoustic wave penetrating power is, and the higher the noise reduction amount of the muffler is.
The sound-deadening performance of the muffler is often lower in sound transmission loss at low sound wave frequencies (longer wavelengths) than at high frequencies, and the noise reduction effect is worse. For example, at normal temperature and pressure, a certain sheet type muffler has a wavelength of incident noise corresponding to a sound transmission loss of 11dB at a low frequency (for example, at a sound wave frequency of 63 Hz) of 5.4m, and a wavelength of incident noise corresponding to a sound transmission loss of 17dB at a higher frequency (for example, at a sound wave frequency of 125 Hz) of 2.72 m.
From the relationship of the speed of sound c to the temperature t: c 2.05(273+ t)1/2And speed of sound c, frequency f, and wavelength λ: f is known as c/λ:
the higher the ambient temperature t, the greater the speed of sound through the environment, and the wavelength of the incident sound wave is proportional to the speed of the sound wave when the frequency of the sound wave is constant. The higher the temperature, the longer the incident acoustic wave wavelength.
Claims (9)
1. An apparatus for shortening the wavelength of the noise incident on a muffler, comprising: the temperature reducing device (2) capable of reducing the temperature of incident airflow and shortening the wavelength of incident noise is arranged at the airflow inlet end of the silencer (1), and the incident airflow passes through the temperature reducing device (2) and enters the silencer (1).
2. The apparatus for shortening the wavelength of the noise incident on the muffler according to claim 1, wherein: the cooling device (2) adopts a water mist cooling structure (3).
3. The apparatus for shortening the wavelength of the noise incident on the muffler according to claim 2, wherein: water smoke cooling structure (3) comprise casing (6), delivery pipe (31), grid formula air current passageway (32) and shower nozzle (33) that can make the water atomization, casing (6) are the cylindric, and its inner links as an organic wholely with silencer (1) shell (11), is equipped with a plurality of baffles (34) that extend along the bobbin shaft direction in casing (6), and all baffles (34) constitute a plurality of grid formula air current passageway (32) through the cross arrangement, lay one in every grid formula air current passageway (32) shower nozzle (33), delivery pipe (31) pass casing (6) stretch into in a section of thick bamboo and communicate with all shower nozzles (33).
4. The apparatus for shortening the wavelength of the noise incident on the muffler according to claim 3, wherein: the section shape of the shell (6) is the same as that of the shell (11) of the silencer (1), and the section shape of the grid type airflow channel (32) is a quadrangle, a circle, a fan or a figure formed by intersection of two concentric circles and the fan.
5. The apparatus for shortening the wavelength of the noise incident on the muffler according to claim 4, wherein: the thickness of the clapboard (34) is 2mm-5mm, and the length of the clapboard (34) is 200mm-1000 mm.
6. The apparatus for shortening the wavelength of the noise incident on the muffler according to claim 1, wherein: the cooling device (2) is a heat exchanger (4) with fins (42), the heat exchanger (4) is fixedly connected in a hollow shell (6) with two open ends, and incident airflow enters the silencer (1) through gaps between the fins (42).
7. The device that can shorten the wavelength of the noise incident on the muffler according to any one of claims 1 to 6, characterized in that: a temperature sensor (5) is arranged between the airflow inlet end of the silencer (1) and the cooling device (2).
8. The apparatus for shortening the wavelength of the noise incident on the muffler according to claim 5 or 6, wherein: the shell (6) is made of stainless steel, titanium or carbon galvanized steel plate, and the length of the shell is 350-1150 mm.
9. The device capable of shortening the wavelength of an incident noise of a muffler according to any one of claims 3 to 5, wherein: the distance between two adjacent spray heads is 100-400 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020911512.4U CN212457555U (en) | 2020-05-25 | 2020-05-25 | Device capable of shortening incident noise wavelength of silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020911512.4U CN212457555U (en) | 2020-05-25 | 2020-05-25 | Device capable of shortening incident noise wavelength of silencer |
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| Publication Number | Publication Date |
|---|---|
| CN212457555U true CN212457555U (en) | 2021-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020911512.4U Active CN212457555U (en) | 2020-05-25 | 2020-05-25 | Device capable of shortening incident noise wavelength of silencer |
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| CN (1) | CN212457555U (en) |
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- 2020-05-25 CN CN202020911512.4U patent/CN212457555U/en active Active
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