CN119042445B - A low-resistance rectifier silencer - Google Patents
A low-resistance rectifier silencerInfo
- Publication number
- CN119042445B CN119042445B CN202411198109.0A CN202411198109A CN119042445B CN 119042445 B CN119042445 B CN 119042445B CN 202411198109 A CN202411198109 A CN 202411198109A CN 119042445 B CN119042445 B CN 119042445B
- Authority
- CN
- China
- Prior art keywords
- tube
- cannula
- inlet
- rectifying
- outlet
- 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.)
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Links
Classifications
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- 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
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- 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
- F16L55/027—Throttle passages
- F16L55/02754—Throttle passages using a central core throttling the passage
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Exhaust Silencers (AREA)
Abstract
本发明属于管路消声领域，并具体公开了一种低阻整流式消声装置，其包括外管、进口插管、外穿孔管、出口插管、内穿孔管和整流管，其中：进口插管、外穿孔管、出口插管依次连接，并均位于外管内；对于进口插管、外穿孔管和出口插管形成的整体，其外侧与外管之间填充有吸声材料；进口插管为锥形渐扩管，出口插管为锥形渐缩管；整流管为进口封闭的锥形渐扩管，其位于装置轴中心，并靠近进口侧；内穿孔管与整流管连接，内穿孔管与整流管内形成整流腔；内穿孔管和外穿孔管上均开设有多个孔，内穿孔管与外穿孔管同轴设置。本发明装置可以在有效提高消声量的同时还能保证低阻力性能，减少膨胀腔的频率限制，且结构简单便于制作。
The present invention belongs to the field of pipeline silencer and specifically discloses a low-resistance rectifier silencer, which includes an outer tube, an inlet cannula, an outer perforated tube, an outlet cannula, an inner perforated tube and a rectifier tube, wherein: the inlet cannula, the outer perforated tube and the outlet cannula are connected in sequence and are all located inside the outer tube; the outer side of the inlet cannula, the outer perforated tube and the outlet cannula are filled with sound-absorbing material between the outer tube and the outer tube; the inlet cannula is a tapered gradually diverging tube, and the outlet cannula is a tapered gradually converging tube; the rectifier tube is a tapered gradually diverging tube with a closed inlet, which is located at the center of the device axis and close to the inlet side; the inner perforated tube is connected to the rectifier tube, and a rectifier cavity is formed in the inner perforated tube and the rectifier tube; multiple holes are opened on the inner perforated tube and the outer perforated tube, and the inner perforated tube and the outer perforated tube are coaxially arranged. The device of the present invention can effectively improve the sound attenuation while ensuring low resistance performance and reducing the frequency limit of the expansion cavity, and has a simple structure and is easy to manufacture.
Description
Technical Field
The invention belongs to the field of pipeline noise elimination, and particularly relates to a low-resistance rectifying type noise elimination device.
Background
The muffler means that for a fluid conduit having noise propagation at the same time, noise in the conduit is attenuated or reflected back. In order to reduce noise of the pipeline system, a low-resistance rectifying type silencing device is arranged in a flow passage between the boards of the centralized cooling system to carry out silencing control on the pipeline system, and meanwhile, the design requirement of low resistance of self-flowing operation of the centralized cooling system is met. The existing resistive muffler device is mainly applied to low-frequency noise elimination, the high-frequency sound absorption effect of the resistive muffler device is good, but the flow resistance is large, and the micro-perforation muffler device still has certain limit on the passing frequency. The impedance composite muffler device can improve the noise elimination amount of the whole frequency band, but still has the problem of larger passing frequency and flow resistance.
In view of this, there is a need for a sound damping structure that satisfies both the sound damping requirements of the overall frequency band and the low resistance requirements of operation.
Disclosure of Invention
Aiming at the defects or improvement demands of the prior art, the invention provides a low-resistance rectifying type silencing device, which aims to control silencing of a pipeline system and simultaneously give consideration to low resistance demands of self-flow operation of a concentrated cooling system while improving silencing quantity.
In order to achieve the above object, according to an aspect of the present invention, there is provided a low-resistance rectifying muffler device including an outer pipe, an inlet pipe, an outer pipe, an outlet pipe, an inner pipe, and a rectifying pipe, wherein:
The inlet cannula, the outer perforated pipe and the outlet cannula are sequentially connected and are all positioned in the outer pipe, and sound absorbing materials are filled between the outer side of the whole formed by the inlet cannula, the outer perforated pipe and the outlet cannula and the outer pipe;
the rectifying tube is a conical gradually-expanding tube with a closed inlet, the conical gradually-expanding tube is positioned at the center of a device shaft and is close to the inlet side of the device, the inner perforated tube is connected with the rectifying tube, a rectifying cavity is formed in the inner perforated tube and the rectifying tube, a plurality of holes are formed in the inner perforated tube and the outer perforated tube, and the inner perforated tube and the outer perforated tube are coaxially arranged.
As a further preferred aspect, the effective length of the inlet cannula is 0.5L, the effective length of the outlet cannula is 0.25L, L is the effective length of the outer tube, and the effective length refers to the length in the axial direction of the device.
As further preferable, the inlet cannula and the outlet cannula are both rigid tube walls, a 1/4 resonance cavity is formed in the corresponding area of the inlet cannula and the outer tube, and a 1/4 resonance cavity is formed in the corresponding area of the outlet cannula and the outer tube.
Further preferably, the diffusion angle of the inlet cannula is 10-14 degrees, and the shrinkage angle of the outlet cannula is 10-40 degrees.
As further preferable, the ratio of the area of the outlet of the inlet cannula to the area of the inlet is 2:1-6:1, and the ratio of the area of the inlet of the outlet cannula to the area of the outlet is 2:1-6:1.
As a further preferable mode, the perforation rates of the inner perforated pipe and the outer perforated pipe are 10% -20%, and the aperture of each hole is 2% -5 mm.
Further preferably, the aspect ratio of the low-resistance rectifying muffler device is 1.2-3.
As a further preferred aspect, the sound absorbing material is polyurethane sound absorbing cotton.
As a further preferred aspect, a support plate is provided between the outer perforated pipe and the inner perforated pipe for support.
As a further preferred aspect, the inlet cannula, the outer perforated tube, the outlet cannula, the inner perforated tube, the rectifier tube and the support plate are all made of stainless steel plate.
In general, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
1. According to the invention, the sound absorption material is arranged outside the rectification cavity, so that the sound absorption quantity can be effectively improved. Simultaneously, the whole device forms the expansion chamber, and through the cooperation of toper diverging import intubate and rectifying tube as the reposition of redundant personnel structure, can reduce the liquid jointly and flow into the expansion chamber from outside tubule, the area suddenly changes the high resistance that produces, very big reduction the loss of resistance. Therefore, the noise reduction device can effectively improve the noise reduction amount and simultaneously ensure the low resistance performance, has a simple structure, is convenient to manufacture, and is suitable for wide popularization in the fields of pipeline noise reduction and the like.
2. The liquid is split into two parts after entering the muffler device, and the sound carried by one part of the liquid enters the sound absorption material area through the outer perforated pipe, and the sound energy is converted into heat energy through energy conversion to consume one part of the sound, and meanwhile, the sound generates resonance in the 1/4 resonance cavity to carry out noise elimination. The sound carried by another part of fluid enters the rectification cavity through the inner perforated pipe, and part of sound energy is consumed by the sound passing through the perforated wall, so that the overall frequency band sound attenuation is improved.
3. The longer the cannula length is, the lower the peak frequency in the transmission loss curve is, the smaller the resistance loss of the muffler is, the effective length of the inlet cannula is designed to be 0.5L, the effective length of the outlet cannula is designed to be 0.25L, the specific length of the inlet cannula is 1/2 of the length of the expansion cavity, the odd-numbered times of the half wavelength passing frequency can be eliminated, the length of the outlet cannula is 1/4 of the length of the expansion cavity, the even-numbered times of the half wavelength passing frequency can be eliminated, and the frequency limit of the expansion cavity is reduced.
4. When the angle of the conical insertion tube is smaller than a certain angle, the resistance loss caused by abrupt change of the section can be effectively reduced, and the diffusion angle and the contraction angle of the inlet insertion tube and the outlet insertion tube are designed accordingly.
5. The larger the expansion ratio of the conical tube is, the better the silencing performance is, but the larger the resistance loss is, the balance resistance and the silencing quantity are, and the expansion ratio of the low-resistance rectifying type silencer is designed according to the expansion ratio, so that the silencing quantity can be improved as much as possible on the premise of meeting the space size requirement.
6. The muffler has the advantages that the muffler can improve the silencing performance of the muffler at medium and high frequencies by reducing the perforation aperture or increasing the perforation rate of the perforation pipe, and the smaller the perforation aperture or the smaller the perforation rate is, the smaller the pressure loss of the muffler is. In order to balance the noise elimination performance and the resistance performance, the perforation rate of the inner perforated pipe and the outer perforated pipe is 10% -20%, and the aperture of each hole is 2% -5 mm.
Drawings
FIG. 1 is a radial cross-sectional view of a low resistance flow-straightening muffler device according to an embodiment of the present invention;
FIG. 2 is an axial cross-sectional view of a low resistance flow-straightening muffler device according to an embodiment of the present invention;
Fig. 3 is a transmission loss curve of the low-resistance rectifying muffler device according to the embodiment of the present invention.
In all figures the same reference numerals are used to designate the same elements or structures wherein 1-inlet cannula, 2-outer perforated tube, 3-rectifying tube, 4-sound absorbing region, 5-support plate, 6-outlet cannula, 7-inner perforated tube, 8-outer tube.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The embodiment of the invention provides a low-resistance rectifying type muffler device, which is shown in fig. 1 and 2, and comprises an outer tube 8, an inlet insertion tube 1, an outer perforated tube 2, an outlet insertion tube 6, an inner perforated tube 7 and a rectifying tube 3, wherein:
The inlet cannula 1, the outer perforated tube 2 and the outlet cannula 6 are connected in sequence and are positioned in the outer tube 8, and the whole inside of the outer tube 8 is an expansion cavity; for the whole formed by the inlet insertion pipe 1, the outer perforated pipe 2 and the outlet insertion pipe 6, a sound absorption material is filled between the outer side of the whole and the outer pipe 8 to form a sound absorption area 4;
The inlet cannula 1 is a conical gradual-enlarging pipe, the outlet cannula 6 is a conical gradual-reducing pipe, and the conical pipe structure can effectively reduce the flow resistance loss;
The rectifying tube 3 is a conical gradual expanding tube with a closed inlet, is positioned in the axial center of the expansion cavity and is close to the inlet side, and can reduce the flow resistance in the silencer;
The inner perforated pipe 7 and the outer perforated pipe 2 are provided with a plurality of holes, the inner perforated pipe 7 and the outer perforated pipe 2 are coaxially arranged, preferably the lengths of the inner perforated pipe 7 and the outer perforated pipe 2 are consistent, and a supporting plate 5 is arranged between the outer perforated pipe 2 and the inner perforated pipe 7 for supporting.
Furthermore, the inlet cannula 1 and the outlet cannula 6 are both rigid tube walls, the inlet cannula 1 and the expansion cavity wall (corresponding region of the outer tube 8 is within the same range in the axial direction of the device) form a 1/4 resonant cavity, and the outlet cannula 6 and the expansion cavity wall (corresponding region of the outer tube 8) form a 1/4 resonant cavity. In addition, when the resonance frequency is equal to the passing frequency of the muffler itself, the sound-deadening quantity of the muffler can be improved.
Further, the diffusion angle of the inlet cannula 1 is 10-14 degrees, and the shrinkage angle of the outlet cannula 6 is 10-40 degrees.
Further, the ratio of the area of the outlet of the inlet cannula 1 to the area of the inlet is 2:1-6:1, and the ratio of the area of the inlet of the outlet cannula 6 to the area of the outlet is 2:1-6:1.
Further, the effective length of the inlet cannula 1 is 0.5L, the effective length of the outlet cannula 6 is 0.25L, L is the effective length of the outer tube 8, and the effective length refers to the length in the axial direction of the device.
Further, the length-diameter ratio of the device (i.e. the expansion chamber) is 1.2-3. The larger the length-diameter ratio is, the better the silencing performance is, the larger the resistance loss is, and the length-diameter ratio of the device is designed for balancing the silencing performance and the resistance loss.
Further, the perforation rates of the inner perforated pipe 7 and the outer perforated pipe 2 (the percentage of the holes on the surface of the pipe wall to the surface area of the whole pipe wall) are 10% -20%, and the aperture of each hole is 2% -5 mm.
Further, the sound absorbing material is polyurethane sound absorbing cotton.
Further, the inlet cannula 1, the outer perforated tube 2, the outlet cannula 6, the inner perforated tube 7, the rectifying tube 3 and the supporting plate 5 are all made of stainless steel plates.
The following are specific examples:
In the low-resistance rectifying type muffler device, the expansion ratio of an inlet cannula 1 to an outlet cannula 6 is 4, the diffusion angle of the inlet cannula 1 is 12.5 degrees, the contraction angle of the outlet cannula 6 is 24.5 degrees, the effective length of the inlet cannula 1 is 0.5L, the effective length of the outlet cannula 6 is 0.25L, the length-diameter ratio of an expansion cavity is 1.3, the wall thicknesses of an inner perforated pipe 7 and an outer perforated pipe 2 are 4mm, the perforation rates are 15 percent, and the aperture of each hole is 5mm.
For this low-resistance rectifying muffler device, when the inlet flow rate was 4.07m/s, the inlet pressure was 9452.5Pa, the outlet pressure was 8309.9Pa, and the pressure loss was 1142.6Pa. As shown in FIG. 3, the low-resistance rectifying muffler basically eliminates the phenomenon that the passing frequency is lower than 8dB only in the frequency range of 1400-1500 Hz, 2700-2800 Hz, the lowest sound insulation is 5.6dB, the sound insulation is higher than 8dB in the rest frequency bands, and the sound insulation is about 2800 Hz. The average sound insulation amount in the frequency of 50-3000 Hz is 15.8dB, and the sound insulation effect is good.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. The utility model provides a low resistance rectification formula noise eliminator, its characterized in that includes outer tube (8), import intubate (1), outer perforated pipe (2), export intubate (6), interior perforated pipe (7) and rectifier tube (3), wherein:
The inlet cannula (1), the outer perforated pipe (2) and the outlet cannula (6) are sequentially connected and are all positioned in the outer pipe (8), and sound absorption materials are filled between the outer side of the whole formed by the inlet cannula (1), the outer perforated pipe (2) and the outlet cannula (6) and the outer pipe (8), wherein the inlet cannula (1) is a conical divergent pipe, and the outlet cannula (6) is a conical divergent pipe;
The rectifying tube (3) is a conical gradually-expanding tube with a closed inlet, is positioned in the center of a device shaft and is close to the inlet side of the device, the inner perforated tube (7) is connected with the rectifying tube (3), a rectifying cavity is formed in the inner perforated tube (7) and the rectifying tube (3), a plurality of holes are formed in the inner perforated tube (7) and the outer perforated tube (2), and the inner perforated tube (7) and the outer perforated tube (2) are coaxially arranged;
The effective length of the inlet cannula (1) is 0.5L, the effective length of the outlet cannula (6) is 0.25L, L is the effective length of the outer tube (8), and the effective length refers to the length in the axial direction of the device;
the inlet cannula (1) and the outlet cannula (6) are both rigid tube walls, a 1/4 resonant cavity is formed in the corresponding area of the inlet cannula (1) and the outer tube (8), and a 1/4 resonant cavity is formed in the corresponding area of the outlet cannula (6) and the outer tube (8).
2. The low-resistance rectifying muffler device according to claim 1, characterized in that the diffusion angle of the inlet cannula (1) is 10 ° -14 °, and the contraction angle of the outlet cannula (6) is 10 ° -40 °.
3. The low-resistance rectifying type muffler device according to claim 1, wherein the ratio of the area at the outlet of the inlet cannula (1) to the area at the inlet is 2:1-6:1, and the ratio of the area at the inlet of the outlet cannula (6) to the area at the outlet is 2:1-6:1.
4. The low-resistance rectifying type muffler device according to claim 1, wherein the perforation rates of the inner perforated pipe (7) and the outer perforated pipe (2) are 10% -20%, and the aperture of each hole is 2-5 mm.
5. The low resistance rectifying muffler device according to claim 1, wherein the aspect ratio of the low resistance rectifying muffler device is 1.2 to 3.
6. The low resistance rectifying muffler device according to claim 1, wherein said sound absorbing material is polyurethane sound absorbing cotton.
7. The low-resistance rectifying muffler device as claimed in any one of claims 1 to 6, characterized in that a support plate (5) is provided between the outer perforated pipe (2) and the inner perforated pipe (7) for support.
8. The low-resistance rectifying muffler device according to claim 7, characterized in that the inlet cannula (1), the outer perforated tube (2), the outlet cannula (6), the inner perforated tube (7), the rectifying tube (3) and the supporting plate (5) are all made of stainless steel plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411198109.0A CN119042445B (en) | 2024-08-29 | 2024-08-29 | A low-resistance rectifier silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411198109.0A CN119042445B (en) | 2024-08-29 | 2024-08-29 | A low-resistance rectifier silencer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN119042445A CN119042445A (en) | 2024-11-29 |
| CN119042445B true CN119042445B (en) | 2025-09-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202411198109.0A Active CN119042445B (en) | 2024-08-29 | 2024-08-29 | A low-resistance rectifier silencer |
Country Status (1)
| Country | Link |
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| CN (1) | CN119042445B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120175929B (en) * | 2025-03-20 | 2026-02-06 | 西安理工大学 | High-frequency silencer for pipelines based on acoustic mode modulation and perforated pipes and its design method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204663627U (en) * | 2015-04-02 | 2015-09-23 | 刘玺 | Be applicable to combined impedance silencing apparatus that is middle and high, low frequency noise elimination |
| CN107120288A (en) * | 2017-04-28 | 2017-09-01 | 麦克维尔空调制冷(武汉)有限公司 | A kind of exhaust silencer for screw unit |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5706850A (en) * | 1996-11-19 | 1998-01-13 | Carrier Corporation | Oil diffuser |
| CN2682211Y (en) * | 2004-02-23 | 2005-03-02 | 王浩国 | Silencer for perforated pipe |
| JP2011012869A (en) * | 2009-07-01 | 2011-01-20 | Panasonic Corp | Air conditioner |
| CN204677259U (en) * | 2015-04-29 | 2015-09-30 | 麦克维尔空调制冷(武汉)有限公司 | A kind of exhaust silencer for screw type unit |
-
2024
- 2024-08-29 CN CN202411198109.0A patent/CN119042445B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204663627U (en) * | 2015-04-02 | 2015-09-23 | 刘玺 | Be applicable to combined impedance silencing apparatus that is middle and high, low frequency noise elimination |
| CN107120288A (en) * | 2017-04-28 | 2017-09-01 | 麦克维尔空调制冷(武汉)有限公司 | A kind of exhaust silencer for screw unit |
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| CN119042445A (en) | 2024-11-29 |
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