CN107956751B - Silencing device and sweeping machine - Google Patents
Silencing device and sweeping machine Download PDFInfo
- Publication number
- CN107956751B CN107956751B CN201711214596.5A CN201711214596A CN107956751B CN 107956751 B CN107956751 B CN 107956751B CN 201711214596 A CN201711214596 A CN 201711214596A CN 107956751 B CN107956751 B CN 107956751B
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- muffler
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- 230000030279 gene silencing Effects 0.000 title claims abstract description 60
- 238000010408 sweeping Methods 0.000 title description 4
- 241001417527 Pempheridae Species 0.000 claims abstract description 14
- 239000000428 dust Substances 0.000 claims description 30
- 238000007791 dehumidification Methods 0.000 claims description 14
- 230000003584 silencer Effects 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000013016 damping Methods 0.000 abstract description 18
- 230000008602 contraction Effects 0.000 abstract description 2
- 230000008030 elimination Effects 0.000 description 7
- 238000003379 elimination reaction Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000001743 silencing effect Effects 0.000 description 4
- 239000011358 absorbing material Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000001603 reducing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
- F04D29/665—Sound attenuation by means of resonance chambers or interference
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The application relates to a silencing device and a road sweeper, wherein the silencing device comprises a shell and a first silencing structure, the shell is provided with an air inlet and an air outlet, the first silencing structure is arranged in a channel formed between the air inlet and the air outlet, the first silencing structure comprises a first group of silencing cavities and a second group of silencing cavities which are communicated with the channel, two adjacent cavities in the first group of silencing cavities are communicated through an opening, and two adjacent cavities in the second group of silencing cavities are communicated through a porous plate. The area of the opening in the first group of sound-damping cavities and the sectional area of the cavities have a preset proportional relationship, sound waves are reflected and interfered by expansion and contraction of the cross-sectional areas to be damped, and medium-frequency and low-frequency sound waves can be damped better; the second group of silencing cavities can be used for silencing medium-frequency and high-frequency sound waves by utilizing the combination of the porous plate and the cavities; therefore, the embodiment of the application can be used for silencing high, medium and low frequency band sound waves, and is suitable for the field requiring broadband silencing.
Description
Technical Field
The application relates to the field of engineering machinery, in particular to a silencing device and a sweeping machine.
Background
The road sweeper usually works in the early morning or at night, the working noise of the road sweeper inevitably produces certain interference to the life of operators and surrounding residents, the fan noise is a main sound source of the road sweeper, the fan noise is reduced, and the road sweeper has very important practical significance for improving the competitiveness of products. The installation of a muffler at the outlet of the fan is one of effective schemes for reducing fan noise. The muffler can be classified into a resistive muffler, a resistive composite muffler, and the like according to its muffler mechanism. The sound damping principle of a resistive muffler is to partially absorb sound energy propagating along a pipe using sound absorbing materials within the pipe. The resistive muffler utilizes resonance sound absorption structures of pipelines and perforated pipes with various shapes and sizes to cause impedance mismatch of sound waves in the system, so that the sound waves are reflected and consumed back and forth in the pipelines and the resonance cavity, and the purpose of muffling is achieved. The impedance composite muffler combines the resistive muffler and the resistive muffler, thereby realizing the purpose of broadband noise elimination.
At present, a fan muffler adopts a resistive or single noise elimination structure, has poor noise elimination effect on the broadband noise of the fan, and has more dust in the air at the outlet of the fan due to a special working mode of the sweeping vehicle, the resistive noise elimination structure is easy to block, the humidity at the outlet of the fan is large, the noise elimination effect is easy to drop after long-time working, and the service life of the muffler is reduced. The technical problems which are urgently needed to be solved by the person skilled in the art are achieved by improving the silencing effect of the fan silencer and facilitating cleaning.
Disclosure of Invention
The application aims to provide a silencing device and a road sweeper, wherein the silencing device can solve the problem of poor broadband noise silencing effect.
In order to achieve the above object, the present application provides a muffler device, which includes a housing and a first muffler structure, wherein the housing is provided with an air inlet and an air outlet, the first muffler structure is disposed in a channel formed between the air inlet and the air outlet, the first muffler structure includes a first group of muffler chambers and a second group of muffler chambers which are communicated with the channel, two adjacent chambers in the first group of muffler chambers are communicated through openings, and two adjacent chambers in the second group of muffler chambers are communicated through porous plates.
In a preferred or alternative embodiment, the first set of muffling cavities comprises a first cavity and a second cavity, the first cavity being provided with a first opening and a second opening, the first opening communicating with the passage and the second opening communicating with the second cavity.
In a preferred or alternative embodiment, the area of the first opening and the area of the second opening are each 1/4 to 1/3 of the cross-sectional area of the first chamber.
In a preferred or alternative embodiment, the first set of muffling cavities comprises a third cavity provided with a third opening communicating with the second cavity.
In a preferred or alternative embodiment, the area of the third opening is 1/3 to 1/2 of the cross-sectional area of the second chamber.
In a preferred or alternative embodiment, the first set of muffling chambers includes two third chambers, one on each side of the second chamber.
In a preferred or alternative embodiment, the second set of muffling chambers includes a fourth chamber and a fifth chamber, the fourth chamber being provided with a first perforated plate and a second perforated plate, the first perforated plate communicating with the channels and the second perforated plate communicating with the fifth chamber.
In a preferred or alternative embodiment, the fourth chamber has a volume at least twice the volume of the fifth chamber.
In a preferred or alternative embodiment, the first sound attenuating structure includes two second sets of sound attenuating cavities, one on each side of the first set of sound attenuating cavities.
In a preferred or alternative embodiment, the first sound attenuating structure comprises a tube, a first end of which communicates with the passage and a second end of which is closed.
In a preferred or alternative embodiment, the tubes are disposed through the first set of sound-damping chambers and/or the second set of sound-damping chambers.
In a preferred or alternative embodiment, the first sound attenuating structure comprises at least two tubes, each tube having a different or the same length.
In a preferred or alternative embodiment, the side of the first sound attenuating structure in communication with the passageway is located laterally of the direction of air flow introduced by the air inlet.
In a preferred or alternative embodiment, the muffler device includes a dust removal and dehumidification structure disposed within and in communication with the passage.
In a preferred or alternative embodiment, the side of the dust and moisture removing structure in communication with the channel faces the direction of the air flow introduced into the air inlet.
In a preferred or alternative embodiment, the dust removal and dehumidification structure comprises a cavity shell, wherein the cavity shell comprises a third porous plate arranged facing the air inlet, and a dust collection plate and a water absorption material are arranged in the cavity shell.
In a preferred or alternative embodiment, the muffler device includes a second muffler structure disposed within the passageway with a predetermined distance between the second muffler structure and the first muffler structure to form the expansion chamber.
In a preferred or alternative embodiment, the second sound attenuating structure is located adjacent the air outlet relative to the first sound attenuating structure and the first sound attenuating structure is located adjacent the air inlet relative to the second sound attenuating structure.
In a preferred or alternative embodiment, the second sound attenuating structure is a resistive sound attenuating structure.
In order to achieve the above object, the present application provides a road sweeper including the above-mentioned muffler device.
In a preferred or alternative embodiment, the road sweeper comprises a centrifugal fan, and the muffler device is arranged at the exhaust end of the centrifugal fan.
Based on the technical scheme, the application has at least the following beneficial effects:
in the embodiment of the application, a first silencing structure is arranged in a channel of a shell, and comprises a first group of silencing cavities and a second group of silencing cavities which are communicated with the channel; adjacent two cavities in the first group of sound-damping cavities are communicated through an opening, the area of the opening and the sectional area of the cavity have a preset proportional relationship, sound waves are reflected and interfered by expansion and contraction of the cross-sectional area to be damped, and medium-frequency sound waves and low-frequency sound waves can be damped well; adjacent two cavities in the second group of sound-eliminating cavities are communicated through a porous plate, and the combination of the porous plate and the cavities can eliminate sound waves of medium frequency and high frequency; therefore, the embodiment of the application can be used for silencing high, medium and low frequency band sound waves, and is suitable for the field requiring broadband silencing.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a schematic view of a muffler device according to an embodiment of the present application in front view and partially in cross section;
FIG. 2 is a schematic rear view of a muffler device according to an embodiment of the present application;
FIG. 3 is a schematic cross-sectional view of A-A of FIG. 1;
FIG. 4 is a schematic view of a first muffler structure according to an embodiment of the present application after being tilted at a certain angle;
FIG. 5 is a schematic cross-sectional view of B-B of FIG. 4;
FIG. 6 is a schematic diagram of a dust removal and dehumidification structure provided by the embodiment of the application;
FIG. 7 is a schematic cross-sectional view of C-C of FIG. 6.
The reference numbers in the drawings:
1-a housing; 11-an air inlet; 12-an air outlet; 13-side mounting port;
2-a first sound attenuating structure;
21-a first set of sound-attenuating cavities; 211-a first cavity; 212-a second chamber; 213-a first opening; 214-a second opening; 215-a third chamber; 216-a third opening;
22-a second set of sound-canceling cavities; 221-fourth chamber; 222-a fifth chamber; 223-a first porous plate; 224-a second perforated plate;
23-tube;
3-a dust removal and dehumidification structure; 31-a chamber housing; 32-a third porous plate; 33-a dust collection plate; 34-a water absorbing material;
4-a second sound attenuating structure;
5-dilating lumen.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present application.
As shown in fig. 1, 2 and 3, the muffler device provided in the embodiment of the application includes a housing 1 and a first muffler structure 2, the housing 1 is provided with an air inlet 11 and an air outlet 12, a channel is formed between the air inlet 11 and the air outlet 12 in the housing 1, and the first muffler structure 2 is disposed in the channel. The first sound attenuating structure 2 includes a first group of sound attenuating cavities 21 and a second group of sound attenuating cavities 22 that communicate with the channels. Adjacent two cavities in the first group of silencing cavities 21 are communicated through openings, the areas of the openings and the sectional areas of the cavities have a preset proportional relationship, and the cross-sectional areas expand and contract to cause the reflection and interference of sound waves to perform silencing, so that intermediate-frequency and low-frequency sound waves can be better silenced. Adjacent two chambers in the second group of sound-damping chambers 22 are communicated through a porous plate, and the combination of the porous plate and the chambers can damp medium-frequency and high-frequency sound waves.
Therefore, the embodiment of the application can be used for silencing high, medium and low frequency band sound waves, and is suitable for the field requiring broadband silencing.
The muffler device provided by the embodiment of the application has a full-band muffler effect, and the first muffler structure 2 provided by the embodiment of the application is a combined type resistance muffler structure, and has the characteristics of high temperature resistance, moisture resistance, difficult blockage and easy cleaning compared with the resistance muffler structure in the prior art. Therefore, the noise reduction device is suitable for noise reduction of the fan of the road sweeper (the noise frequency band of the fan of the road sweeper is wider).
The silencer provided by the embodiment of the application is a broadband silencer capable of absorbing noise in different frequency bands, and can be in various combination forms according to different working conditions, and the following detailed description is provided by combining the embodiments.
As shown in fig. 5, the first group of sound-damping cavities 21 in the embodiment of the present application may include a first cavity 211 and a second cavity 212, where the first cavity 211 is provided with a first opening 213 and a second opening 214, the first opening 213 communicates with the channel, and the second opening 214 communicates with the second cavity 212. The first cavity 211 mainly eliminates mid-low frequency noise.
Alternatively, the area of the first opening 213 and the area of the second opening 214 are each 1/4 to 1/3 of the sectional area of the first chamber 211. Preferably, the area of the first opening 213 is equal to the area of the second opening 214.
In the above embodiment, the first group of sound-damping chambers 21 may further include a third chamber 215, the third chamber 215 being provided with a third opening 216 communicating with the second chamber 212.
The second cavity 211 and the third cavity 215 are mainly used for eliminating low frequency noise of a specific frequency band.
In a preferred or alternative embodiment, the first set of sound-damping cavities 21 may comprise two third cavities 215, the two third cavities 215 being located on either side of the second cavity 212.
Optionally, the area of the third opening 216 is 1/3 to 1/2 of the cross-sectional area of the second chamber 212.
Further, the areas of the third openings 216 of the two third cavities 215 may be the same or different, and preferably the areas of the third openings 216 of the two third cavities 215 are different, and the specific value may be calculated according to the acoustic wave frequency band to be eliminated.
The second group of muffling chambers 22 in the embodiment of the present application may include a fourth chamber 221 and a fifth chamber 222, the fourth chamber 221 being provided with a first perforated plate 223 and a second perforated plate 224, the first perforated plate 223 communicating with the channels, the second perforated plate 224 communicating with the fifth chamber 222.
Optionally, the fourth chamber 221 has a volume at least twice the volume of the fifth chamber 222.
In the above-described embodiment, the penetration rate of the first porous plate 223 and the second porous plate 224 may be different.
In a preferred or alternative embodiment, the first sound attenuating structure 2 may include two second sets of sound attenuating cavities 22, and the two second sets of sound attenuating cavities 22 may be located on either side of the first set of sound attenuating cavities 21 (as shown in fig. 4).
The first sound attenuating structure 2 of the present embodiment may further include a pipe 23, a first end of the pipe 23 communicating with the passage, and a second end of the pipe 23 being closed.
In a preferred or alternative embodiment, the tubes 23 may be provided through the first set of sound-damping chambers 21 and/or the second set of sound-damping chambers 22. As shown in fig. 5, the tube 23 is provided to pass through the second group of muffler chambers 22.
Alternatively, the first sound attenuating structure 2 may include at least two tubes 23, and the lengths of the tubes 23 may be different or the same, and the lengths of the tubes 23 may be calculated according to different characteristic frequencies.
The first sound damping structure 2 in the above embodiments is a combined type resistive sound damping structure, which includes a first group of sound damping cavities 21 communicated through openings, a second group of sound damping cavities 22 communicated through porous plates, and a pipe 23, so that high frequency, intermediate frequency, low frequency, fundamental frequency of a fan, frequency multiplication noise thereof, and the like can be effectively reduced.
In order to avoid the pressure loss caused by the air flow introduced by the air inlet 11 directly flowing to the first silencing structure 2, one side of the first silencing structure 2 communicated with the channel is arranged at the side edge of the air flow introduced by the air inlet 11. Specifically, the first opening 213 and the first porous plate 223 are provided at the side of the direction of the air flow introduced from the air inlet 11.
The silencer provided by the embodiment of the application can further comprise the dust removing and dehumidifying structure 3, wherein the dust removing and dehumidifying structure 3 is arranged in the channel and communicated with the channel, so that dust and moisture in air flow in the silencer can be effectively reduced, and the service life of the silencer and the noise reduction effect of the silencer are improved.
In the above embodiment, the side of the dust removal dehumidification structure 3, which is communicated with the channel, is arranged facing the direction of the air flow introduced into the air inlet 11, so that the air flow directly flows to the dust removal dehumidification structure 3, the air flow introduced through the air inlet 11 is firstly subjected to dust removal dehumidification, and the dust removal dehumidification structure 3 can be used for silencing to a certain extent, and then the first silencing structure 2 is further used for silencing, so that the service life and silencing effect of the first silencing structure 2 can be improved.
In a preferred or alternative embodiment, as shown in fig. 6 and 7, the dust and moisture removing structure 3 may include a chamber shell 31, where the chamber shell 31 includes a third porous plate 32 disposed facing the air inlet 11, and a dust collecting plate 33 and a water absorbing material 34 are disposed in the chamber shell 31. By arranging the dust collection plate 33 and the water absorption material 34, dust and moisture in the muffler device can be effectively reduced, the muffler device has a good noise elimination effect, and the service life of the muffler device is prolonged.
Alternatively, the front projected area of the chamber housing 31 may be larger than the sectional area of the air intake 11. Preferably, the orthographic projection area of the chamber housing 31 is 1.3 to 1.6 times the sectional area of the air inlet 11. The thickness of the chamber housing 31 should be smaller than the thickness of the channel, and the thickness of the chamber housing 31 is preferably 1/4 to 1/3 of the thickness of the channel.
Optionally, the third porous plate 32 has a certain included angle with the horizontal plane, and the included angle is preferably 45-65 degrees, so that the dust removing effect in the interval is optimal, and the noise reducing effect is certain. The aperture of the third porous plate 32 may be 1mm to 2mm, and the penetration rate may be 5% to 8%.
The dust and moisture removing structure 3 not only can effectively reduce dust and moisture, has a good silencing effect, prolongs the service life of the silencing device, but also is simple in structure and convenient to install.
The muffler device provided by the embodiment of the application may further include a second muffler structure 4, where the second muffler structure 4 is disposed in the channel, and a preset distance is provided between the second muffler structure 4 and the first muffler structure 2 to form an expansion cavity 5.
Optionally, the expansion chamber 5 is disposed between the air inlet 11 and the air outlet 12 and is a cuboid cavity, and the cross-sectional area of the expansion chamber 5 is greater than or equal to two times the cross-sectional area of the air inlet 11/the cross-sectional area of the air outlet 12, preferably 3-6 times the cross-sectional area of the air inlet 11.
The above embodiment enables the expansion chamber 5 to be formed in the housing 1, and the expansion ratio and the area of the air inlet 11 have a corresponding proportional relationship, so that the noise can be effectively reduced without adding other noise elimination structures.
In the above embodiment, the second sound attenuating structure 4 is located near the air outlet 12 with respect to the first sound attenuating structure 2, and the first sound attenuating structure 2 is located near the air inlet 11 with respect to the second sound attenuating structure 4.
Optionally, the second sound attenuating structure 4 is a resistive sound attenuating structure. The resistive silencing structure is located at the air outlet 12 and can be detachably connected in the casing 1.
For example: the second silencing structure 4 may specifically include a plurality of silencing sheets and a fastening structure, where the plurality of silencing sheets may be installed on a fastening groove of the bottom plate of the housing 1 through the fastening structure, and the number of the silencing sheets may be changed according to the actual size in the housing 1, and preferably three.
Specific mounting positions of the first sound damping structure 2, the dust removal and dehumidification structure 3 and the second sound damping structure 4 in a specific embodiment of the sound damping device are listed below.
The front plate of the housing 1 is provided with an air inlet 11, and the air inlet 11 is preferably arranged at one side of the upper end of the front plate. An air outlet 12 is arranged on the lower side of the backboard of the shell 1. The cross-sectional area of the air outlet 12 is preferably 2 to 2.5 times the cross-sectional area of the air inlet 11.
Be equipped with the side mounting mouth 13 that is used for installing first sound-deadening structure 2 on the curb plate that is adjacent with the front bezel of casing 1, side mounting mouth 13 is high with air intake 11 etc. and side mounting mouth 13 is located the curb plate of keeping away from air intake 11, can conveniently arrange first sound-deadening structure 2, and this kind of layout mode is minimum to its circulation of air influence.
Alternatively, the first sound attenuating structure 2 is parallel to the air intake 11 and connected to the side mounting opening 13. The dust removal and dehumidification structure 3 is arranged on the back plate of the shell 1 and is opposite to the air inlet 11. The second silencing structure 4 is mounted on the bottom plate of the shell 1 and located at the air outlet 12.
The embodiment of the application also provides a road sweeper, which comprises the silencing device.
The road sweeper in the above embodiment comprises a centrifugal fan, and the muffler device provided in the embodiment is arranged at the exhaust end of the centrifugal fan.
In the description of the present application, it should be understood that the terms "first," "second," "third," etc. are used for defining components, and are merely for convenience in distinguishing the components, and if not otherwise stated, the terms are not to be construed as limiting the scope of the present application.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present application and are not limiting; while the application has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present application or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the application, it is intended to cover the scope of the application as claimed.
Claims (15)
1. A muffler device, characterized in that: the silencer comprises a shell (1) and a first silencing structure (2), wherein the shell (1) is provided with an air inlet (11) and an air outlet (12), the first silencing structure (2) is arranged in a channel formed between the air inlet (11) and the air outlet (12), the first silencing structure (2) comprises a first group of silencing cavities (21) and a second group of silencing cavities (22) which are communicated with the channel, two adjacent cavities in the first group of silencing cavities (21) are communicated through openings, and two adjacent cavities in the second group of silencing cavities (22) are communicated through porous plates;
the first group of sound-absorbing cavities (21) comprises a first cavity (211) and a second cavity (212), the first cavity (211) is provided with a first opening (213) and a second opening (214), the first opening (213) is communicated with the channel, and the second opening (214) is communicated with the second cavity (212);
the area of the first opening (213) and the area of the second opening (214) are 1/4-1/3 of the cross-sectional area of the first cavity (211);
the first group of sound-reducing cavities (21) comprises a third cavity (215), and the third cavity (215) is provided with a third opening (216) communicated with the second cavity (212);
the first group of sound-reducing cavities (21) comprises two third cavities (215), and the two third cavities (215) are respectively positioned at two sides of the second cavity (212);
the second group of sound-reducing cavities (22) comprises a fourth cavity (221) and a fifth cavity (222), the fourth cavity (221) is provided with a first porous plate (223) and a second porous plate (224), the first porous plate (223) is communicated with the channel, and the second porous plate (224) is communicated with the fifth cavity (222);
the first silencing structure (2) comprises two second groups of silencing cavities (22), and the two second groups of silencing cavities (22) are respectively located on two sides of the first groups of silencing cavities (21).
2. The muffler device as defined in claim 1, wherein: the area of the third opening (216) is 1/3-1/2 of the cross-sectional area of the second chamber (212).
3. The muffler device as defined in claim 1, wherein: the fourth chamber (221) has a volume at least twice the volume of the fifth chamber (222).
4. The muffler device as defined in claim 1, wherein: the first silencing structure (2) comprises a tube (23), a first end of the tube (23) is communicated with the channel, and a second end of the tube (23) is closed.
5. The muffler device as defined in claim 4, wherein: the tube (23) is arranged in the first group of sound-eliminating cavities (21) and/or the second group of sound-eliminating cavities (22) in a penetrating way.
6. The muffler device as defined in claim 4, wherein: the first sound attenuating structure (2) comprises at least two tubes (23), the lengths of the tubes (23) being different or identical.
7. The muffler device as defined in claim 1, wherein: one side of the first silencing structure (2) communicated with the channel is arranged on the side edge of the air inlet (11) in the air flow direction.
8. The muffler device as defined in claim 1, wherein: the dust removal and dehumidification device comprises a dust removal and dehumidification structure (3), wherein the dust removal and dehumidification structure (3) is arranged in a channel and communicated with the channel.
9. The muffler device as defined in claim 8, wherein: one side of the dust removing and dehumidifying structure (3) communicated with the channel faces the air flow direction introduced by the air inlet (11).
10. The muffler device as defined in claim 8, wherein: the dust removal dehumidification structure (3) comprises a cavity shell (31), the cavity shell (31) comprises a third porous plate (32) arranged facing the air inlet (11), and a dust collection plate (33) and a water absorption material (34) are arranged in the cavity shell (31).
11. The muffler device as defined in claim 1, wherein: the novel muffler comprises a second muffler structure (4), wherein the second muffler structure (4) is arranged in the channel, and a preset distance is reserved between the second muffler structure (4) and the first muffler structure (2) to form an expansion cavity (5).
12. The muffler device as defined in claim 11, wherein: the second silencing structure (4) is close to the air outlet (12) relative to the first silencing structure (2), and the first silencing structure (2) is close to the air inlet (11) relative to the second silencing structure (4).
13. The muffler device as defined in claim 11, wherein: the second silencing structure (4) is a resistive silencing structure.
14. A road sweeper, characterized in that: a muffler device including any one of claims 1 to 13.
15. A road sweeper as defined in claim 14, wherein: the silencer comprises a centrifugal fan, and the silencer is arranged at the exhaust end of the centrifugal fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711214596.5A CN107956751B (en) | 2017-11-28 | 2017-11-28 | Silencing device and sweeping machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711214596.5A CN107956751B (en) | 2017-11-28 | 2017-11-28 | Silencing device and sweeping machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107956751A CN107956751A (en) | 2018-04-24 |
| CN107956751B true CN107956751B (en) | 2023-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711214596.5A Active CN107956751B (en) | 2017-11-28 | 2017-11-28 | Silencing device and sweeping machine |
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| CN (1) | CN107956751B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108730239B (en) * | 2018-06-01 | 2020-03-17 | 徐工集团工程机械有限公司 | Fan noise eliminator and road cleaning vehicle |
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| JP2013060920A (en) * | 2011-09-14 | 2013-04-04 | Kawasaki Heavy Ind Ltd | Muffling device |
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| CN105358838B (en) * | 2013-07-05 | 2017-03-29 | 三菱电机株式会社 | Pressure fan and off-premises station |
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