CN108331789A - A kind of adjustable magnetorheological piezoelectricity muffler of damping - Google Patents
A kind of adjustable magnetorheological piezoelectricity muffler of damping Download PDFInfo
- Publication number
- CN108331789A CN108331789A CN201810285376.XA CN201810285376A CN108331789A CN 108331789 A CN108331789 A CN 108331789A CN 201810285376 A CN201810285376 A CN 201810285376A CN 108331789 A CN108331789 A CN 108331789A
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- Prior art keywords
- cavity
- cylinder
- sound
- shaft
- absorbing blade
- Prior art date
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Links
- 238000013016 damping Methods 0.000 title claims abstract description 28
- 239000000758 substrate Substances 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 12
- 239000011490 mineral wool Substances 0.000 claims abstract description 6
- 239000012530 fluid Substances 0.000 claims description 8
- 229910000906 Bronze Inorganic materials 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 3
- 239000010974 bronze Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 238000005192 partition Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 12
- 230000030279 gene silencing Effects 0.000 abstract description 3
- 238000010521 absorption reaction Methods 0.000 description 5
- 230000003584 silencer Effects 0.000 description 4
- 238000007664 blowing Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001743 silencing effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/12—Combinations with mechanical gearing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/141—Shape, i.e. outer, aerodynamic form
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/147—Construction, i.e. structural features, e.g. of weight-saving hollow blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0027—Pulsation and noise damping means
- F04B39/0083—Pulsation and noise damping means using blow off silencers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/001—Noise damping
-
- 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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
- F16F9/535—Magnetorheological [MR] fluid dampers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/161—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general in systems with fluid flow
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/185—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators using fluid streams
Abstract
The present invention relates to exhaust noise silencing apparatus fields, and in particular to a kind of adjustable magnetorheological piezoelectricity muffler of damping.Including hollow cylinder, air inlet pipe and an air outlet pipe is equipped with along cylinder both ends；Cylinder includes shell, mineral wool and perforated plate；Cylinder is divided into the first cavity, the second cavity and third cavity along vertical tubular axis direction by left clapboard and right clapboard in cylinder, air inlet pipe is communicated with the first cavity, and escape pipe is communicated with third cavity；Left clapboard is equipped with the shaft coaxial with cylinder, extend into the shaft of the first cavity and is equipped with sound-absorbing blade, and sound-absorbing blade is bonded by piezoelectric chip and metal substrate, and the shaft for extending into the second cavity is equipped with damping unit.Advantage and characteristic：The kinetic energy of air-flow is transformed into mechanical energy using sound-absorbing blade, acoustical absorptivity is strong；The electric energy generated using piezoelectric effect gives damping unit self-powered, simple in structure, reduces cost.
Description
Technical field
The present invention relates to exhaust noise silencing apparatus fields, and in particular to a kind of adjustable magnetorheological piezoelectricity exhaust noise silencing of damping
Device.
Background technology
Exhaust silencer be prevent sound transmission and allow air-flow by a kind of device, be eliminate air power noise
Important measures.Exhaust silencer be mounted in air powered equipment (such as air blower, air compressor machine, boiler exhaust mouth, generator,
The larger equipment of the exhaust outlet noises such as water pump) exhaust system in reduction noise device.There are many type of exhaust silencer,
It is developed according to anti-, spray, resistance composite sound damping principle, mainly there is micropore jet and dilatation sound absorption.
In the prior art, the exhaust noise silencing effect of exhaust silencer is not ideal enough, and reason is：1. based on micropore jet
Noise reduction method has the intrinsic frequency of oneself, the sound wave of certain frequencies only near mesh intrinsic frequency due to each hole
Could be by mesh, therefore acoustic absorptivity is low, absorption band is narrow, and not easy to control；2. the sound-absorbing method based on impedance matching is to low
The effect of frequency is good and high-frequency effect is poor.
Invention content
For the problems of in terms of existing muffler noise reduction, the present invention proposes that a kind of damping is adjustable magnetorheological
Piezoelectricity muffler, the embodiment that the present invention uses are：Including hollow cylinder, along the position of cylinder one end off-axis
Equipped with air inlet pipe, the escape pipe that left end is cone is equipped with along the position of cylinder other end axis；Cylinder includes shell, mineral wool
And perforated plate, several stomatas are provided on perforated plate；In cylinder by left clapboard and right clapboard along vertical tubular axis direction by cylinder
It is divided into the first cavity, the second cavity and third cavity, air inlet pipe is communicated with the first cavity, and escape pipe is communicated with third cavity；
Be provided with left recirculation hole and right recirculation hole on left clapboard and right clapboard in uniform way, left recirculation hole sectional area and be greater than or equal to air inlet
The sum of tube section product, right recirculation hole sectional area and more than or equal to left recirculation hole sectional area sum；Left clapboard is equipped with and cylinder
The coaxial shaft of body, the axis platform end face for extending into the shaft of the first cavity are equipped with sound-absorbing blade by screw, stretched into uniform way
Shaft to the second cavity is equipped with damping unit；Sound-absorbing blade is bonded by piezoelectric chip and metal substrate；Damping unit
Include the end cap and magnetorheological fluid of the circle cup of the cylindrical, hollow coaxial with cylinder, circular ring shape, end cap is mounted on circle by screw
Cup left part is simultaneously fixed by screws on left clapboard, and circle cup and cover internal form a cylindrical cavity；Circle cup inner wall is equal
It is installed with to cloth the external disk of circular ring shape, is arranged in shaft by the evenly spaced inner disc of sleeve, external disk is staggered with inner disc, interior
Disk outer rim is arranged with coil, is full of magnetorheological fluid in the gap formed between circle cup, end cap, external disk, inner disc, coil, sleeve, by
Sealing ring is sealed, and bearing is arranged between shaft and end cap.
In the present invention, to improve the absorbing sound and lowering noise ability of sound-absorbing blade, sound-absorbing blade E is set on the thin axis t1 of shaft t,
And be connected by screw with the end faces axis platform t2, and with axial direction at certain angle of inclination beta (similar blade of electric fan inclination angle), sound-absorbing
Blade pitch angle is β=110 °, and sound-absorbing blade is the iridescent type structure of bending, and the radius of curvature of piezoelectric chip is less than metal substrate
Radius of curvature, piezoelectric chip thickness be 0.15~0.3mm PZT4, metal substrate is beryllium-bronze, metal substrate and piezo crystals
The ratio between thickness of piece is 1~2.5, and the absorbing sound and lowering noise ability of sound-absorbing blade is stronger at this time.
After air-flow enters the first cavity by air inlet pipe, air-flow generates aerodynamic force drive shaft when blowing to sound-absorbing blade and turns
Dynamic, shaft rotation drives inner disc to rotate synchronously；Meanwhile the vibration of sound wave causes the piezoelectric effect of piezoelectric chip, piezoelectric chip by
Power generates charge, and charge is stored by storage circuit, is then applied on the coil of damping unit；By the positive pressure of piezoelectric chip
Therefore electrical effect, it is single to be applied to damping it is found that the quantity of electric charge that generates under pressure of piezoelectric chip is directly proportional to pressure size
Size of current on the coil of member is controlled by the charge value that piezoelectric chip generates, when pneumatic noise vibration force is big, piezoelectricity
The quantity of electric charge that chip generates is with regard to big, therefore the electric current being applied on damping unit coil is with regard to big.The change of electric current can in coil
Cause the change of magnetic field size, the change in magnetic field is so that the mechanical property of magnetorheological fluid changes, so that damping unit
Inner disc damping force is also changed, to realize the intelligent control to outside noise.
The general flow velocity of air-flow in muffler is fast, and pneumatic noise is high, and the kinetic energy of air-flow is transformed into machine by sound-absorbing blade
The acoustical power of various frequency bands has reduced in noise after tool energy, therefore noise greatly weakens, while by the piezoelectric effect of piezoelectric chip,
By acoustic energy be converted into electric energy can active absorption low-frequency sound wave, then rely on perforated plate and mineral wool collective effect can be in Passive intake
High frequency sound wave effectively absorbs residual noise.
Advantage and characteristic：1) kinetic energy of air-flow is transformed into mechanical energy using sound-absorbing blade, reduces the sound work(of various frequency bands
Rate weakens noise, and acoustical absorptivity is strong, and reliability is high；2) electric energy for utilizing piezoelectric effect to generate gives damping unit self-powered, structure
Simply, cost is reduced；3) pass through piezoelectric effect active absorption low-frequency sound wave.
Description of the drawings
Fig. 1 shows for a kind of structure of the adjustable magnetorheological piezoelectricity muffler of damping in a preferred embodiment of the present invention
It is intended to；
Fig. 2 is sound-absorbing blade and rotating shaft assembling structure schematic diagram in a preferred embodiment of the present invention；
Specific implementation mode
A kind of adjustable magnetorheological piezoelectricity muffler of damping, including hollow cylinder V, along the one end cylinder V off-axis
The position of line is equipped with air inlet pipe a, and the escape pipe p that left end is cone p1 is equipped with along the position of cylinder V other end axis；Cylinder V
Including shell b, mineral wool c and perforated plate d, several stomata d1 are provided on perforated plate d；By left clapboard g and right clapboard m in cylinder V
Cylinder V is divided into the first cavity A, the second cavity B and third cavity C, air inlet pipe a and first along vertical cylinder V axis directions
Cavity A is communicated, and escape pipe p is communicated with third cavity C；Left recirculation hole g1 and right stream are provided on left clapboard g and right clapboard m in uniform way
Through-hole m1, left recirculation hole g1 sectional areas and more than or equal to air inlet pipe a sectional areas sum are right recirculation hole m1 sectional areas and big
In or equal to left recirculation hole g1 sectional areas sum；Left clapboard g is equipped with the shaft t coaxial with cylinder V, extend into the first cavity A
The end faces axis platform t2 of shaft t sound-absorbing blade E is installed in uniform way by screw, the shaft t for extending into the second cavity B is equipped with
Damping unit Y；Sound-absorbing blade E is bonded by piezoelectric chip e1 and metal substrate e2；Damping unit Y includes coaxial with cylinder V
The circle cup j of cylindrical, hollow, circular ring shape end cap i and magnetorheological fluid r, end cap i is mounted on the left parts circle cup j simultaneously by screw
It is fixed by screws on left clapboard, a cylindrical cavity is formed inside circle cup j and end cap i；It is with justifying cup j inner wall even distributions fixed
There is the external disk s of circular ring shape, the inner disc q by circular ring shape evenly spaced sleeve n is arranged on shaft t, external disk s interlocks with inner disc q
Arrangement, inner disc q outer rims are arranged with coil k, the gap U formed between circle cup j, end cap i, external disk s, inner disc q, coil k, sleeve n
It is interior to be full of magnetorheological fluid r, it is sealed by sealing ring h, bearing f is set between shaft t and end cap i.
In the present invention, to improve the absorbing sound and lowering noise ability of sound-absorbing blade E, sound-absorbing blade E is set in the thin axis t1 of shaft t
On, and it is connected by screw with the end faces axis platform t2, and with axial direction at certain angle of inclination beta (similar blade of electric fan inclination angle),
The inclinations angle sound-absorbing blade E are β=110 °, and sound-absorbing blade E is the iridescent type structure of bending, and the radius of curvature of piezoelectric chip e1 is less than
The radius of curvature of metal substrate e2, piezoelectric chip e1 thickness are the PZT4 of 0.15~0.3mm, and metal substrate e2 is beryllium-bronze, gold
It is 1~2.5 to belong to the ratio between thickness of substrate e2 and piezoelectric chip e1, and the absorbing sound and lowering noise ability of sound-absorbing blade E is stronger at this time.
After air-flow enters the first cavity A by air inlet pipe a, air-flow generates aerodynamic force drive shaft t when blowing to sound-absorbing blade E
Rotation, shaft t rotations drive inner disc q to rotate synchronously；Meanwhile the vibration of sound wave causes the piezoelectric effect of piezoelectric chip e1, piezoelectricity
Chip e1 stress generates charge, and charge is stored by storage circuit, is then applied on the coil k of damping unit Y；By piezoelectricity
The direct piezoelectric effect of chip e1 it is found that the quantities of electric charge that generate under pressure of piezoelectric chip e1 are directly proportional to pressure size, because
This, the size of current being applied on the coil k of damping unit Y is controlled by the charge value that piezoelectric chip e1 is generated, and works as pneumatic noise
When vibration force is big, the quantity of electric charge that piezoelectric chip e1 is generated is with regard to big, therefore the electric current being applied on damping unit Y coils k
It is just big.The change of electric current can cause the change of magnetic field size, the change in magnetic field to make the mechanical property of magnetorheological fluid r in coil k
It changes, so that damping unit Y inner disc q damping forces are also changed, to realize the intelligent control to outside noise.
The general flow velocity of air-flow in muffler is fast, and pneumatic noise is high, and the kinetic energy of air-flow is transformed into machine by sound-absorbing blade E
After tool energy, the acoustical power of various frequency bands has reduced in noise, therefore noise greatly weakens, while being imitated by the piezoelectricity of piezoelectric chip e1
Answer, by acoustic energy be converted into electric energy can active absorption low-frequency sound wave, then rely on perforated plate d and mineral wool c collective effects can be passive
Medium-high frequency sound wave is absorbed, residual noise is effectively absorbed.
Above is only a specific embodiment of the present invention, but the technical characteristic of the present invention is not limited thereto, Ren Heben
The technical staff in field in the field of the invention, made by changes or modifications all cover the present invention the scope of the claims among.
Claims (1)
1. a kind of adjustable magnetorheological piezoelectricity muffler of damping, it is characterised in that：Including hollow cylinder, along cylinder one end
The position of off-axis is equipped with air inlet pipe, and the escape pipe that left end is cone is equipped with along the position of cylinder other end axis；Cylinder
Including shell, mineral wool and perforated plate, several stomatas are provided on perforated plate；By left clapboard and right clapboard along vertical cylinder in cylinder
Cylinder is divided into the first cavity, the second cavity and third cavity by axis direction, and air inlet pipe is communicated with the first cavity, escape pipe with
Third cavity communicates；Left recirculation hole and right recirculation hole, the sum of left recirculation hole sectional area are provided on left clapboard and right clapboard in uniform way
More than or equal to the sum of air inlet pipe sectional area, right recirculation hole sectional area and more than or equal to left recirculation hole sectional area sum；It is left
Partition board is equipped with the shaft coaxial with cylinder, and the axis platform end face for extending into the shaft of the first cavity is equipped in uniform way by bolt
Sound-absorbing blade, the shaft for extending into the second cavity are equipped with damping unit；Sound-absorbing blade is bonded by piezoelectric chip and metal substrate
It forms；Damping unit includes the end cap and magnetorheological fluid of the circle cup of the cylindrical, hollow coaxial with cylinder, circular ring shape, and end cap passes through
Screw is mounted on circle cup left part and is fixed by screws on left clapboard, and circle cup and cover internal form a cylindrical empty
Chamber；Be installed with to circle cup inner wall even distribution the external disk of circular ring shape, be arranged in shaft by the evenly spaced inner disc of sleeve, external disk with it is interior
Disk is staggered, and inner disc outer rim is arranged with coil, is filled in the gap formed between circle cup, end cap, external disk, inner disc, coil, sleeve
Full magnetorheological fluid, is sealed by sealing ring, bearing is arranged between shaft and end cap；Sound-absorbing blade is set in the thin axis of shaft
On, and be connected by screw with axis platform end face, and with axial direction at certain angle of inclination beta, sound-absorbing blade pitch angle is β=110 °,
Sound-absorbing blade is the iridescent type structure of bending, and the radius of curvature of piezoelectric chip is less than the radius of curvature of metal substrate, piezoelectric chip
Thickness is the PZT4 of 0.15~0.3mm, and metal substrate is beryllium-bronze, the ratio between thickness of metal substrate and piezoelectric chip for 1~
2.5。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810285376.XA CN108331789B (en) | 2018-03-19 | 2018-03-19 | Damping-adjustable magnetorheological piezoelectric exhaust silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810285376.XA CN108331789B (en) | 2018-03-19 | 2018-03-19 | Damping-adjustable magnetorheological piezoelectric exhaust silencer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108331789A true CN108331789A (en) | 2018-07-27 |
| CN108331789B CN108331789B (en) | 2020-09-15 |
Family
ID=62931843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810285376.XA Active CN108331789B (en) | 2018-03-19 | 2018-03-19 | Damping-adjustable magnetorheological piezoelectric exhaust silencer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108331789B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111188423A (en) * | 2020-03-13 | 2020-05-22 | 邵斌 | Building partition plate with noise reduction function for house removal |
| WO2022121563A1 (en) * | 2020-12-08 | 2022-06-16 | 香港大学浙江科学技术研究院 | Adjustable sound insulation device and method for controlling sound insulation |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87205551U (en) * | 1987-03-24 | 1988-01-27 | 昆明大滇实业公司金属推拉窗门厂 | Multi-effect all frequency spring push-pull combined muffler |
| JPH09184497A (en) * | 1995-12-28 | 1997-07-15 | Daikin Ind Ltd | Fan noise reducing device |
| CN1482376A (en) * | 2003-07-24 | 2004-03-17 | 上海交通大学 | Construction variable rotary magnetic current flowing deforming brake |
| CN2659492Y (en) * | 2003-12-05 | 2004-12-01 | 中国科学技术大学 | Combined magnetic rheopetic rotary damper |
| CN1900555A (en) * | 2005-07-20 | 2007-01-24 | 上海工程技术大学 | Rotary type magnetic flow change torque changer |
| CN202789016U (en) * | 2012-07-13 | 2013-03-13 | 成都进界科技有限公司 | Engine exhaust silencer |
| CN206769998U (en) * | 2017-05-12 | 2017-12-19 | 广州卡迅能源科技有限公司 | A kind of muffler of generating set |
-
2018
- 2018-03-19 CN CN201810285376.XA patent/CN108331789B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87205551U (en) * | 1987-03-24 | 1988-01-27 | 昆明大滇实业公司金属推拉窗门厂 | Multi-effect all frequency spring push-pull combined muffler |
| JPH09184497A (en) * | 1995-12-28 | 1997-07-15 | Daikin Ind Ltd | Fan noise reducing device |
| CN1482376A (en) * | 2003-07-24 | 2004-03-17 | 上海交通大学 | Construction variable rotary magnetic current flowing deforming brake |
| CN2659492Y (en) * | 2003-12-05 | 2004-12-01 | 中国科学技术大学 | Combined magnetic rheopetic rotary damper |
| CN1900555A (en) * | 2005-07-20 | 2007-01-24 | 上海工程技术大学 | Rotary type magnetic flow change torque changer |
| CN202789016U (en) * | 2012-07-13 | 2013-03-13 | 成都进界科技有限公司 | Engine exhaust silencer |
| CN206769998U (en) * | 2017-05-12 | 2017-12-19 | 广州卡迅能源科技有限公司 | A kind of muffler of generating set |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111188423A (en) * | 2020-03-13 | 2020-05-22 | 邵斌 | Building partition plate with noise reduction function for house removal |
| WO2022121563A1 (en) * | 2020-12-08 | 2022-06-16 | 香港大学浙江科学技术研究院 | Adjustable sound insulation device and method for controlling sound insulation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108331789B (en) | 2020-09-15 |
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