CN110775240A - Detachable marine silencing ventilation pipe - Google Patents
Detachable marine silencing ventilation pipe Download PDFInfo
- Publication number
- CN110775240A CN110775240A CN201911086280.1A CN201911086280A CN110775240A CN 110775240 A CN110775240 A CN 110775240A CN 201911086280 A CN201911086280 A CN 201911086280A CN 110775240 A CN110775240 A CN 110775240A
- Authority
- CN
- China
- Prior art keywords
- perforated section
- diameter
- inner sleeve
- section
- marine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63J—AUXILIARIES ON VESSELS
- B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
- B63J2/02—Ventilation; Air-conditioning
- B63J2/10—Ventilating-shafts; Air-scoops
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
- F16L55/0336—Noise absorbers by means of sound-absorbing materials
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Duct Arrangements (AREA)
Abstract
The invention discloses a detachable marine silencing ventilation pipe which comprises an outer sleeve and an inner sleeve. The invention combines the perforated plate and the acoustic material, enlarges the noise elimination frequency band, improves the noise elimination performance of the silencer, effectively reduces the noise of the ventilating duct, does not change the diameter of the flow passage of the air duct, has small airflow resistance and compact structure, and is convenient for replacing and maintaining the sound absorption material.
Description
Technical Field
The invention belongs to the technical field of vibration and noise reduction, relates to a silencing ventilation pipe, and particularly relates to a detachable marine silencing ventilation pipe.
Background
In order to improve the work environment comfort of crew, most ships are equipped with marine air-conditioning and ventilation systems, wherein ventilation ducts are an important component of the air-conditioning and ventilation systems. Since the air-conditioning ventilation duct extends to each cabin, noise generated by mechanical devices such as an air conditioner may affect the comfort of the cabin environment as the airflow in the duct enters the cabin. Since the number of pipes in a ventilation system is very large, and the number of pipes is very easy to become an important way for transmitting noise, the noise reduction aiming at the pipes is an important problem for controlling the noise of ships. The duct noise is mainly caused by vibration of the duct wall structure and turbulence of the fluid in the duct, so that when an air current flows in the ventilation duct, both duct structure noise and aerodynamic noise are generated in the duct, and the noise is directly transmitted to the cabin along the duct.
The traditional mode of damping and reducing noise of the ship cabin ventilating duct mainly comprises the step of coating a sound absorption material by a duct, which needs to spend a large amount of coating materials to coat the whole section of the duct and can consume a large amount of reconstruction time and cost.
The exploration is suitable for the new technology of vibration reduction and noise reduction of the ship ventilation pipeline, and has important practical significance for improving the environmental comfort of the ship cabin. On the basis of analyzing the vibration noise transmission path and transmission efficiency of the ship ventilation pipeline, the device which is low in manufacturing cost, compact in structure and capable of effectively reducing noise transmission in the ventilation pipeline is designed, and has important engineering application value for vibration reduction and noise reduction of the ship ventilation pipeline.
In recent years, the vibration damping mass is introduced into the field of vibration damping and noise reduction of ships, and with the improvement of the requirements of vibration damping and noise reduction, novel structures are gradually developed. The invention discloses a local perforated plate silencing unit, a combined perforated plate silencing unit, a composite silencing sheet, a composite silencing device and a pipeline system, wherein the application number is 201820991506.7, and the invention is named as 'the local perforated plate silencing unit, the combined perforated plate silencing unit, the composite silencing sheet, the composite silencing device and the pipeline system'. The local perforated plate is opposite to the bottom plate, the side plate is clamped between the local perforated plate and the bottom plate, and the driven surface is arranged around the periphery of the local perforated plate to form a silencing cavity together with the local perforated plate and the bottom plate. The local perforated plate silencing unit can reduce resonance absorption frequency and is suitable for low-frequency noise control. However, the invention has complex structure, large flow resistivity and large influence on wind speed, and can only use the perforated plate to eliminate noise, so that the silencing frequency band is narrow and the expected effect cannot be achieved.
The invention patent with the application number of 201721889178.1 and the name of 'air pipe silencer' discloses an air pipe silencer, which comprises a silencer body and a flange, wherein the silencer body comprises a perforated plate and a sound absorption lining, the perforated plate is connected with the air pipe body locally, the sound absorption lining is clamped between the air pipe body and the perforated plate, and the flange and the air pipe body are of an integrally formed structure. When the air pipe is used, air flows through the pipeline of the air pipe body, and under the action of the sound absorption lining, noise of air flow is absorbed by the sound absorption lining through the perforated plate, so that the purpose of controlling the noise is achieved. However, the sound absorption material is fixed inside the perforated plate and cannot be replaced, and the structure that the flange and the air pipe are integrated can increase the radiuses of two ends of the pipeline, so that the occupied space of the pipeline is increased.
Disclosure of Invention
The invention aims to provide a detachable marine silencing ventilation pipe aiming at the problems and the defects of the prior art.
Compared with the traditional pipeline vibration and noise reduction structure, the pipeline vibration and noise reduction structure has stronger vibration and noise reduction capability, and simultaneously solves the problems of high manufacturing cost, large occupied space area, incapability of replacing sound absorption materials and the like.
In order to achieve the purpose, the technical scheme adopted by the invention for achieving the purpose is as follows:
a detachable marine silencing ventilation pipe comprises an outer sleeve and an inner sleeve, and is characterized in that the inner sleeve is inserted into the outer sleeve, and a sound absorption material is filled between the outer sleeve and the inner sleeve.
Preferably, the inner sleeve is composed of a perforated section and a non-perforated section, wherein the wall of the inner sleeve is provided with a plurality of through holes, the end face of the non-perforated section is provided with a flange, the end face of the perforated section is provided with a shoulder I, and the circumferential surface between the perforated section and the non-perforated section is provided with a shoulder II.
Preferably, the outer sleeve is composed of two sections of air pipes with large and small diameters, wherein a flange plate is arranged on the end face of the small diameter section; the small diameter section has a length equal to the length of the non-perforated section of the inner sleeve.
Further preferably, the perforation rate of the perforation section is 20% -40%, the hole diameter is 3-8 mm, and the hole distance is 1-2 times of the hole diameter.
More preferably, the length of the non-perforated segment is 1/5-1/10 of the length of the perforated segment.
Further preferably, the sound absorption material is needle-punched cotton, glass fiber or superfine fiber, and the ratio of the thickness of the sound absorption material to the diameter of the inner sleeve is 1: 10-1: 15.
Further preferably, the outer diameter of the shoulder I is 1-2 mm smaller than the inner diameter of the outer sleeve; the outer diameter of the shoulder II is 1-2 mm larger than that of the outer sleeve.
The invention has the advantages and beneficial effects that:
1. the invention uses the perforated plate and the acoustic material to combine, enlarges the noise elimination frequency range and improves the noise elimination performance of the silencer. The insertion loss in the frequency band of 100Hz-5000Hz can reach 10dB at most. The transmission of noise in the ship ventilation pipeline can be effectively reduced.
2. The invention is arranged between the ventilating ducts of the ship and does not occupy the area of the cabin of the ship. Compared with the method of coating the sound absorption material through a pipeline, the method saves a large amount of coating materials, modification time and cost. Has high benefit ratio and good economical efficiency.
3. The silencer adopted by the invention does not change the diameter of the original air pipe, has small flow resistivity and has little influence on the original air speed in the air pipe. The perforated plate can effectively reduce the noise of the resonance frequency band, the acoustic material can reduce the noise frequency band wider, and the perforated plate and the acoustic material have better noise elimination effect after being combined.
4. The perforated plate and the acoustic material can be combined according to the actual vibration reduction requirement of the ventilation pipeline, so that the specified noise standard is achieved. The ship ventilation pipeline is convenient to modularize manufacture and install. Has good application prospect.
Drawings
Fig. 1 is a perspective view of the present invention.
Fig. 2 is a sectional view of fig. 1, which is a structural configuration diagram of the present invention.
Fig. 3 is a schematic structural view of an outer sleeve of the present invention.
Figure 4 is a schematic view of the inner sleeve structure of the present invention.
FIG. 5 is a graph of experimental data for the present invention.
Detailed Description
The present invention is further illustrated by the following more detailed description of the invention, taken in conjunction with the accompanying drawings, which are to be construed as illustrative only and not limiting of the scope of the invention, as defined in the appended claims, as modified in all equivalent forms thereof by those skilled in the art upon reading the present specification.
As shown in fig. 1-4, the detachable marine muffling ventilating pipe comprises an outer sleeve and an inner sleeve, wherein the inner sleeve is inserted into the outer sleeve, and sound-absorbing material is filled between the outer sleeve and the inner sleeve.
In this embodiment, the inner sleeve is composed of a perforated section and a non-perforated section, the perforated section and the non-perforated section are provided with a plurality of through holes on the wall of the inner sleeve, a flange is arranged on the end face of the non-perforated section, a shoulder I is arranged on the end face of the perforated section, and a shoulder II is arranged on the circumferential surface between the perforated section and the non-perforated section.
In the embodiment, the outer sleeve is composed of two sections of air pipes with large and small diameters, wherein the end face of the small diameter section is provided with a flange plate; the small diameter section has a length equal to the length of the non-perforated section of the inner sleeve.
In the embodiment, the perforation rate of the perforation section is 20% -40%, the hole diameter is 3-8 mm, and the hole distance is 1-2 times of the hole diameter.
In the embodiment, the length of the non-perforated segment is 1/5-1/10 of the length of the perforated segment.
In this embodiment, the sound absorbing material is made of needle-punched cotton, glass fiber or superfine fiber, and the ratio of the thickness of the sound absorbing material to the thickness of the inner sleeve is 1: 10-1: 15.
In the embodiment, the outer diameter of the shoulder I is 1-2 mm smaller than the inner diameter of the outer sleeve; the outer diameter of the shoulder II is 1-2 mm larger than that of the outer sleeve.
The working principle is as follows:
the inner sleeve has through holes and cavities behind the holes, and the through hole plate structure is several Helmholtz resonators connected parallelly. When the frequency of the incident sound wave is consistent with the resonance frequency of the system, the air of the perforated plate neck generates violent vibration friction, the absorption effect is enhanced, an absorption peak is formed, and the sound energy is gradually attenuated; far from the resonance frequency, the absorption is less. A resonant frequency of
Wherein S
0Is the cross section area of a small hole; v is the volume of the closed cavity; l'
0Is the effective length of the throat. l'
0＝l
0+ Δ l, t is the thickness of the perforated plate; Δ l is a correction term, and for a circular hole with a diameter d, Δ l is 0.8 d. Flow resistance R of sound absorption material
fΔ p/ν. Wherein, Δ p is the pressure difference between two sides of the material, and v is the linear velocity of the air flow passing through the material. The flow resistance at the hole neck can be increased by tightly attaching the sound absorption material behind the perforated plate, so that the frequency bandwidth can be increased, and meanwhile, the sound absorption coefficient can also be increased.
As shown in the experimental data of fig. 5, the abscissa is frequency, unit: hz, ordinate is the transmission loss unit: dB. a first set of experiments was noise damping cylinder transmission loss with perforated plate only, data shown as dotted lines. b second set of experiments with muffling cartridge transmission loss of sound absorbing material only, data shown as dashed lines. c third set of experiments with muffling cartridge transmission loss, data shown as dashed lines. Therefore, the sound-absorbing tube of the embodiment has better sound-absorbing effect in the frequency range of 200-3500Hz, and the total sound-absorbing effect in the test frequency range is better than that of a silencer only provided with a perforated plate and a sound-absorbing material
The foregoing is only a preferred embodiment of the present invention. The present invention is capable of other embodiments, and various changes and modifications can be made by one skilled in the art without departing from the spirit and scope of the invention. All technical solutions which are formed by adopting equivalent substitutions or equivalent transformations shall fall within the protection scope of the appended claims.
Claims (7)
1. A detachable marine silencing ventilation pipe comprises an outer sleeve (1) and an inner sleeve (2), and is characterized in that the inner sleeve (2) is inserted into the outer sleeve (1), and a sound absorption material (3) is filled between the outer sleeve (1) and the inner sleeve (2).
2. The detachable marine muffling ventilation pipe according to claim 1, wherein the inner sleeve (2) comprises a perforated section (2-1) and a non-perforated section (2-2) which are provided with a plurality of through holes on the wall, wherein a flange is arranged on the end surface of the non-perforated section (2-2), a shoulder I is arranged on the end surface of the perforated section (2-1), and a shoulder II is arranged on the circumferential surface between the perforated section (2-1) and the non-perforated section (2-2).
3. A detachable marine muffling ventilation pipe according to claim 2, wherein the outer sleeve (1) is composed of two sections of pipes with large and small diameters, and a flange is arranged on the end face of the small-diameter section; the minor diameter section is equal in length to the non-perforated section (2-2) of the inner sleeve (2).
4. A detachable marine muffling vent pipe according to claim 3, wherein the perforated section (2-1) has a perforation rate of 20 to 40%, a hole diameter of 3 to 8mm, and a hole pitch of 1 to 2 times the hole diameter.
5. A disassembled marine muffling vent pipe according to claim 3, wherein the length of the non-perforated section (2-2) is 1/5-1/10 of the length of the perforated section (2-1).
6. A detachable marine muffling ventilation pipe according to claim 3, wherein the sound-absorbing material (3) is needle-punched cotton, glass fiber or microfiber, and the ratio of the thickness of the sound-absorbing material to the diameter of the inner sleeve (2) is 1:10 to 1: 15.
7. A detachable marine muffling vent pipe according to claim 3, wherein the outer diameter of the shoulder I is 1-2 mm smaller than the inner diameter of the outer sleeve (1); the outer diameter of the shoulder II is 1-2 mm larger than that of the outer sleeve (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911086280.1A CN110775240A (en) | 2019-11-08 | 2019-11-08 | Detachable marine silencing ventilation pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911086280.1A CN110775240A (en) | 2019-11-08 | 2019-11-08 | Detachable marine silencing ventilation pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110775240A true CN110775240A (en) | 2020-02-11 |
Family
ID=69389702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911086280.1A Pending CN110775240A (en) | 2019-11-08 | 2019-11-08 | Detachable marine silencing ventilation pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110775240A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114110291A (en) * | 2021-11-24 | 2022-03-01 | 江苏科技大学 | Elastic plate type straight-through perforated pipe water muffler with static pressure balance cavity and assembling method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200993279Y (en) * | 2006-12-20 | 2007-12-19 | 贵阳铝镁设计研究院 | Anti-leakage sleeve-tube type pipeline compensator |
| CN201187857Y (en) * | 2008-04-03 | 2009-01-28 | 中国舰船研究设计中心 | Assembly type ventilation pipeline silencer |
| CN103644402A (en) * | 2013-12-11 | 2014-03-19 | 山东景津环保设备有限公司 | Rotary type pipeline connector of filter press |
| CN205118518U (en) * | 2015-11-02 | 2016-03-30 | 沈阳市永安衬胶阀门管道有限责任公司 | Line with rubber pipeline telescopic joint |
| CN206782038U (en) * | 2017-05-18 | 2017-12-22 | 无锡市汤成机电配件厂 | Water proof type straight barrel type ventilation duct peculiar to vessel |
| CN108224740A (en) * | 2018-03-09 | 2018-06-29 | 中建安装工程有限公司 | A kind of multistage impedance composite silencer and sound reduction method |
| CN110065615A (en) * | 2019-06-05 | 2019-07-30 | 泰州市沪江特种设备有限公司 | Low noise exhausting unit peculiar to vessel |
| CN110285272A (en) * | 2019-06-13 | 2019-09-27 | 江苏科技大学 | A kind of ventilation shaft elastic composite resistance vibration connector peculiar to vessel |
-
2019
- 2019-11-08 CN CN201911086280.1A patent/CN110775240A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200993279Y (en) * | 2006-12-20 | 2007-12-19 | 贵阳铝镁设计研究院 | Anti-leakage sleeve-tube type pipeline compensator |
| CN201187857Y (en) * | 2008-04-03 | 2009-01-28 | 中国舰船研究设计中心 | Assembly type ventilation pipeline silencer |
| CN103644402A (en) * | 2013-12-11 | 2014-03-19 | 山东景津环保设备有限公司 | Rotary type pipeline connector of filter press |
| CN205118518U (en) * | 2015-11-02 | 2016-03-30 | 沈阳市永安衬胶阀门管道有限责任公司 | Line with rubber pipeline telescopic joint |
| CN206782038U (en) * | 2017-05-18 | 2017-12-22 | 无锡市汤成机电配件厂 | Water proof type straight barrel type ventilation duct peculiar to vessel |
| CN108224740A (en) * | 2018-03-09 | 2018-06-29 | 中建安装工程有限公司 | A kind of multistage impedance composite silencer and sound reduction method |
| CN110065615A (en) * | 2019-06-05 | 2019-07-30 | 泰州市沪江特种设备有限公司 | Low noise exhausting unit peculiar to vessel |
| CN110285272A (en) * | 2019-06-13 | 2019-09-27 | 江苏科技大学 | A kind of ventilation shaft elastic composite resistance vibration connector peculiar to vessel |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114110291A (en) * | 2021-11-24 | 2022-03-01 | 江苏科技大学 | Elastic plate type straight-through perforated pipe water muffler with static pressure balance cavity and assembling method |
| CN114110291B (en) * | 2021-11-24 | 2023-09-19 | 江苏科技大学 | Elastic plate type straight-through perforated pipe water muffler with static pressure balance cavity and assembly method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106468197B (en) | A kind of wideband noise-reducing silencer | |
| CN106015818A (en) | Noise elimination energy-saving pipeline | |
| CN111649009A (en) | Composite noise eliminator for air inlet of high-speed centrifugal fan | |
| CN207503634U (en) | Runner oise damping means | |
| CN110775240A (en) | Detachable marine silencing ventilation pipe | |
| CN214741561U (en) | Sound attenuation structure, muffler and unmanned aerial vehicle based on super material of acoustics | |
| CN207634397U (en) | Ventilation silencer | |
| CN113153817A (en) | Ventilating duct comprehensive noise reduction and elimination structure | |
| CN210829439U (en) | Low-flow-resistance broadband composite gas circuit silencer | |
| CN2695702Y (en) | Silencer for axial fan | |
| CN107610688A (en) | A kind of compound sound insulating structure of lumen | |
| CN215595959U (en) | Silencer of axial flow fan | |
| CN204716362U (en) | Engineering machinery noise-reducing silencer | |
| CN112610300A (en) | Low-flow-resistance broadband composite gas circuit silencer | |
| CN111503410A (en) | Helmholtz type silencer | |
| CN210830985U (en) | Rectangular array silencer for ventilation pipeline | |
| CN2192001Y (en) | Compound silencing elbow for minisize hole plate | |
| CN215597743U (en) | Silencer and silencing device | |
| CN113153825A (en) | A silencing device and fan for fan | |
| RU157128U1 (en) | COMBINED SILENCER OF AERODYNAMIC NOISE | |
| CN204327348U (en) | A kind of pipeline high frequency silencing apparatus for turbosupercharger | |
| CN112460076A (en) | Main exhaust fan array type silencer for large air volume and strong mixed noise | |
| CN210687445U (en) | Double-square-shaped silencer for ventilating duct | |
| WO2022001831A1 (en) | Silencing unit, and honeycomb muffler | |
| CN212509000U (en) | Composite noise eliminator for air inlet of high-speed centrifugal fan |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200211 |
|
| RJ01 | Rejection of invention patent application after publication |