US20100089689A1 - Silencer for pneumatic device - Google Patents

Silencer for pneumatic device Download PDF

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Publication number
US20100089689A1
US20100089689A1 US12/450,000 US45000008A US2010089689A1 US 20100089689 A1 US20100089689 A1 US 20100089689A1 US 45000008 A US45000008 A US 45000008A US 2010089689 A1 US2010089689 A1 US 2010089689A1
Authority
US
United States
Prior art keywords
silencer
pneumatic device
inner casing
outer casing
acoustical absorbent
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.)
Abandoned
Application number
US12/450,000
Other languages
English (en)
Inventor
Ho-Young Cho
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Korea Pneumatic System Co Ltd
Original Assignee
Korea Pneumatic System Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Korea Pneumatic System Co Ltd filed Critical Korea Pneumatic System Co Ltd
Publication of US20100089689A1 publication Critical patent/US20100089689A1/en
Assigned to KOREA PNEUMATIC SYSTEM CO., LTD reassignment KOREA PNEUMATIC SYSTEM CO., LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHO, HO-YOUNG
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with sound-absorbing materials
    • 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
    • F16L55/02772—Throttle passages using spirally or helically shaped channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/13—Noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/06—Silencing
    • 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
    • F16L55/02781—The regulating element being provided with radial outputs
    • 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
    • F16L55/0279—The fluid flowing two or more times longitudinally in opposite directions, e.g. using parallel or concentric tubes

Definitions

  • the present invention relates to a silencer, which is coupled to an outlet of a pneumatic device, which is actuated using compressed air, so as to reduce noise.
  • pneumatic device is a general term for devices that are actuated using compressed air as drive force, for example, including a vacuum pump, a vacuum cylinder, a vacuum conveyor, a vacuum motor, etc.
  • the above-mentioned devices have an air inlet and an air outlet therein.
  • a silencer for reducing noise is required.
  • FIGS. 1 and 2 illustrate conventional silencers.
  • the silencer 1 of FIG. 1 includes a cylindrical body 2 , which has a plurality of through holes in the sidewall thereof, and a porous acoustical absorbent 3 , which is charged into the cylindrical body 2 .
  • An open end of the cylindrical body 2 is coupled to an outlet of a pneumatic device.
  • the silencer 4 of FIG. 2 includes a coupling fitting 5 , and an acoustical absorbent 6 , which is fastened to the fitting 5 .
  • the fitting 5 is coupled to an outlet of a pneumatic device.
  • the conventional silencers 1 and 4 are problematic in that an excessive amount of acoustical absorbent 3 , 6 is required, and in that, despite the use of an excessive amount of acoustical absorbent, because the distance that noise passes through the acoustical absorbent 3 , 6 is relatively short, the noise absorption effect is unsatisfactory.
  • the use of the acoustical absorbent 3 , 6 induces an increase in exhaust pressure, but the conventional techniques have no means of mitigating this problem.
  • FIG. 3 illustrates a silencer 7 , which was proposed recently.
  • the silencer 7 includes a pipe-shaped body 8 , and a cylindrical acoustical absorbent 9 , which is provided on the inner surface of the body 8 .
  • the silencer 7 has an advantage in that the amount of acoustical absorbent 9 that is used can be reduced compared to that of the prior silencer 1 or 4 .
  • an object of the present invention is to provide a silencer which efficiently uses a relatively small amount of acoustical absorbent.
  • Another object of the present invention is to provide a silencer in which the lengths of the contact surface of the acoustical absorbent and the air passage can be maximized in the limited length of the silencer.
  • a further object of the present invention is to provide a silencer which can vary the direction in which air is exhausted outside the silencer.
  • the present invention provides a silencer for a pneumatic device, including: an inner casing open at a first end thereof and closed at a second end thereof, with transverse air guide means formed in the open end or the closed end of the inner casing, the air guide means communicating with an outlet of the pneumatic device; an outer casing provided coaxially around the inner casing such that a space for communicating with the air guide means is defined between the inner casing and the outer casing, with an exhaust hole formed in the outer casing at a position opposite the air guide means, the exhaust hole communicating with the space; and an acoustical absorbent provided in the space defined between the inner casing and the outer casing.
  • the acoustical absorbent has a spiral shape.
  • compressed air which is output from the pneumatic device, is guided into the space defined between the inner casing and the outer casing through the air guide means of the silencer and, thereafter, it passes through the acoustical absorbent and is exhausted outside the silencer through the exhaust hole.
  • noise is absorbed by the acoustical absorbent, so that the generation of noise is markedly reduced.
  • a relatively small amount of the acoustical absorbent is provided between the inner and outer casings, which form a coaxial double pipe structure.
  • the acoustical absorbent is configured such that noise passes through the acoustical absorbent in the longitudinal direction, thus ensuring a superior noise absorption effect.
  • the acoustical absorbent has a spiral shape, the length thereof is maximally extended, thus further increasing the noise absorption effect. Furthermore, because the acoustical absorbent defines a spiral passage, the exhaust pressure of compressed air is markedly reduced. Meanwhile, in the silencer of the present invention, which has the double pipe structure, the direction in which compressed air is finally exhausted outside the silencer can be changed by slightly rotating the outer casing.
  • the silencer according to the present invention includes an inner casing and an outer casing, which has a space there between, and an acoustical absorbent, which is provided in the space between the inner and outer casings.
  • the acoustical absorbent is configured such that noise passes through the acoustical absorbent in the longitudinal direction, thus ensuring a superior noise absorption effect.
  • the acoustical absorbent has a spiral shape, the length thereof is maximally extended, thus further increasing the noise absorption effect.
  • the acoustical absorbent defines a spiral passage, the exhaust pressure of compressed air is markedly reduced.
  • FIGS. 1 , 2 and 3 are sectional views showing several conventional silencers
  • FIG. 4 is a perspective view of a silencer, according to a first embodiment of the present invention.
  • FIG. 5 is an exploded perspective view of FIG. 4 ;
  • FIG. 6 is a sectional view of FIG. 4 ;
  • FIG. 7 is a perspective view of a silencer, according to a second embodiment of the present invention.
  • FIG. 8 is a view illustrating the operation of the silencer according to the present invention.
  • silencer 11. inner casing 12. outer casing 15. hole 16, 20. flange 18. space 19. exhaust hole 22. acoustical absorbent 23. vacuum ejector
  • a silencer according to a first embodiment of the present invention is designated by the reference numeral 10 .
  • the silencer 10 includes an inner casing 11 , which has a hollow structure, and an outer casing 12 , which is coaxially provided around the inner casing 11 , thus forming a double pipe structure.
  • the inner casing 11 has a cylindrical shape, which is open at a first end 13 thereof and closed at a second end 14 thereof.
  • Holes 15 serving as transverse air guide means are formed in the inner casing adjacent to the closed end 14 .
  • at least two holes 15 are formed around the closed end 14 .
  • air guide holes 15 may be formed around the open end 13 in the inner casing 11 (see, FIG. 7 ).
  • a flange 16 for supporting the outer casing 12 , which is coaxially provided around the inner casing 11 , and an external threaded part 17 for enabling the silencer 10 to be coupled to a pneumatic device are provided around the open end 13 of the inner casing 11 .
  • the external threaded part 17 is coupled to or separated from the pneumatic device by rotating a tool holding part 14 a , which is provided on the closed end 14 .
  • the outer casing 12 is coaxially provided around the inner casing 11 such that a space 18 is defined between the inner casing 11 and the outer casing 12 and communicates with the holes 15 .
  • the inner diameter of the outer casing 12 is greater than the outer diameter of the inner casing 11 .
  • An exhaust hole 19 which communicates with the space 18 , is formed in a first end of the outer casing 12 , which is opposite the air guide means 15 .
  • the exhaust hole 19 may be formed in the flange 16 or 20 (see, FIG. 70 ).
  • the outer casing 12 is supported at the first end thereof by the flange 16 of the inner casing 11 , and is supported at a second end thereof by the flange 20 , which is provided around the closed end 14 of the inner casing 11 .
  • the flange 20 is supported by a retainer ring 21 .
  • the orientation of the exhaust hole 19 may be varied by slightly rotating the outer casing 12 .
  • An acoustical absorbent 22 is installed in the space 18 defined between the outer casing 12 and the inner casing 11 .
  • the acoustical absorbent 22 is made of material selected from among porous material, fibrous material and other well-known kinds of air-permeable material.
  • the acoustical absorbent 22 has a spiral shape, so that a spiral passage is defined in the space 18 .
  • FIG. 7 shows that the positions of the holes 15 and the exhaust hole 19 can be varied from those of the first embodiment.
  • the general construction and operation of the embodiment of FIG. 7 with the exception of the holes 15 and the exhaust hole 19 , remains the same as the first embodiment, therefore the same reference numerals are used to designate the same or similar components as those of the first embodiment, and further explanation of this drawing is deemed unnecessary.
  • the silencer 10 of the present invention may be coupled to a vacuum ejector 23 , which is a kind of pneumatic device.
  • the vacuum ejector 23 is a typical ejector, which includes a nozzle body 24 , having a rotationally symmetrical structure, and through holes 26 , which are formed through the sidewall of the nozzle body 24 to communicate the nozzle body 24 with an enclosure space (not shown).
  • the present invention is not limited to any special kind of pneumatic device or any particular structure thereof.
  • the vacuum ejector 23 is mounted to a device which must be exhausted, and is actuated using compressed air, which is drawn thereinto and is exhausted therefrom through an outlet 25 at a high speed, thus forming a negative pressure in the enclosure space.
  • compressed air which has passed through the vacuum ejector 23 , passes through the air guide holes 15 and the space 18 of the silencer 10 of the present invention and is thereafter exhausted outside the silencer 10 through the exhaust hole 19 .
  • noise generated by the ejector is absorbed by the acoustical absorbent 22 while passing through the silencer, so that the generation of noise is markedly reduced.
  • the acoustical absorbent 22 has a spiral structure and thus forms a spiral passage, the length of the acoustical absorbent 22 is maximized, so that the noise reduction effect can be markedly enhanced.
  • the present invention can solve the problem with the conventional silencer, in which exhaust pressure increases due to the use of the acoustical absorbent.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Exhaust Silencers (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Compressor (AREA)
  • Jet Pumps And Other Pumps (AREA)
US12/450,000 2007-03-08 2008-01-29 Silencer for pneumatic device Abandoned US20100089689A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR10-20070022787 2007-03-08
KR1020070022787A KR100755722B1 (ko) 2007-03-08 2007-03-08 공압장치용 사일렌서
PCT/KR2008/000528 WO2008108538A1 (en) 2007-03-08 2008-01-29 Silencer for pneumatic device

Publications (1)

Publication Number Publication Date
US20100089689A1 true US20100089689A1 (en) 2010-04-15

Family

ID=38736579

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/450,000 Abandoned US20100089689A1 (en) 2007-03-08 2008-01-29 Silencer for pneumatic device

Country Status (7)

Country Link
US (1) US20100089689A1 (zh)
EP (1) EP2134937B1 (zh)
JP (1) JP4954297B2 (zh)
KR (1) KR100755722B1 (zh)
CN (1) CN101652539B (zh)
ES (1) ES2691706T3 (zh)
WO (1) WO2008108538A1 (zh)

Cited By (6)

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CN105336317A (zh) * 2015-11-12 2016-02-17 佛山市顺德区键合电子有限公司 一种排氮消声器
US9457214B2 (en) 2009-10-23 2016-10-04 Air Water Safety Service Inc. Gas fire-extinguishing apparatus
US20180119620A1 (en) * 2015-04-03 2018-05-03 Safran Helicopter Engines Flow limiter
WO2019060404A1 (en) * 2017-09-21 2019-03-28 DAO Health COMPACT SELF-CLEARING MUFFLER FOR BREAST EMPTY PUMPS
CN113531267A (zh) * 2021-05-26 2021-10-22 朱梦楠 一种环保消音器
US20220082116A1 (en) * 2020-09-15 2022-03-17 Vortex Pipe Systems LLC Material flow modifier and apparatus comprising same

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JP4988945B2 (ja) * 2009-10-23 2012-08-01 エア・ウォーター防災株式会社 ガス消火設備
CN102011629A (zh) * 2010-12-31 2011-04-13 广东联塑机器制造有限公司 排气消音装置
CN103470343B (zh) * 2013-09-22 2015-09-30 无锡阳工机械制造有限公司 一种消音器
CN104732967B (zh) * 2013-10-29 2020-06-16 杨军 一种利用共面空心管吸收声音的吸声屏
KR101891271B1 (ko) * 2017-07-24 2018-08-24 파워제넥스(주) 소음기
CN108167568A (zh) * 2017-12-28 2018-06-15 王延朝 一种建筑工程排水与暖通气流消声装置
CN108996482B (zh) * 2018-07-18 2020-03-20 杭州科技职业技术学院 一种用于psa制氮机的消音器
CN112628597A (zh) * 2020-11-23 2021-04-09 广州特种承压设备检测研究院 一种高压消声排气装置
KR102439223B1 (ko) * 2022-02-08 2022-09-01 한국자동기술산업 주식회사 원통 회전형 프로펠러를 포함하는 송풍장치
IT202200010490A1 (it) * 2022-05-20 2023-11-20 Ecosys S R L Dispositivo silenziatore
DE102022120076A1 (de) 2022-08-09 2024-02-15 Mann+Hummel Gmbh Schalldämpfer für eine Abscheidevorrichtung für Gas und Abscheidevorrichtung

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US3009531A (en) * 1958-08-01 1961-11-21 Theodore E Mead Muffler
US3129078A (en) * 1961-06-16 1964-04-14 Marian L Hobbs Exhaust muffler filter
US3688868A (en) * 1971-08-26 1972-09-05 Stephen J Gibel Expansion chambered, fail-safe muffler
US4082160A (en) * 1975-04-16 1978-04-04 Firma Carl Freudenberg Silencer for exhausting gas streams
US3957133A (en) * 1975-09-10 1976-05-18 Scovill Manufacturing Company Muffler
US4134472A (en) * 1977-08-29 1979-01-16 Trainor John B Combination muffler and air filter
US4184564A (en) * 1977-08-29 1980-01-22 Trainor John B Combination muffler and air filter
US5109905A (en) * 1977-12-01 1992-05-05 Lambe Donald M Dual chamber pneumatic tire with the chambers separated by a collapsible partition wall
US4316523A (en) * 1980-06-04 1982-02-23 Boretti Napoleon P Silencer for gas discharge devices
US4449609A (en) * 1981-07-31 1984-05-22 Kurt Stoll Muffler for pneumatic apparatus
US4683978A (en) * 1984-11-22 1987-08-04 Tula Silencers (Propriety) Limited Exhaust silencer
US4679597A (en) * 1985-12-20 1987-07-14 Kim Hotstart Mfg. Co., Inc. Liquid pulsation dampening device
US4841728A (en) * 1987-07-10 1989-06-27 Jyh-Jian Jean Straight through type muffler for generating the exhaust flow from an internal combustion engine
US4993512A (en) * 1987-09-09 1991-02-19 Glaenzer Spicer Exhaust duct part in particular for an internal combustion engine
US5078043A (en) * 1989-05-05 1992-01-07 Stephens Mark L Silencer
US5152366A (en) * 1991-03-28 1992-10-06 The United States Of America As Represented By The Secretary Of The Navy Sound absorbing muffler
US5581055A (en) * 1995-08-04 1996-12-03 Kevin G. Self Muffler for air operated hand tools and other pneumatic devices
US6062339A (en) * 1995-11-27 2000-05-16 Hathaway; Dana B. Compact spiral cavity loudspeaker enclosure
US5952923A (en) * 1996-08-08 1999-09-14 Als International Limited Apparatus and method for magnetising security targets
US5902362A (en) * 1996-11-15 1999-05-11 Paoluccio; John A. Expansion coalescing silencer filter system
US5767459A (en) * 1996-11-18 1998-06-16 Ingersoll-Rand Company Muffler for pneumatic devices
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US9457214B2 (en) 2009-10-23 2016-10-04 Air Water Safety Service Inc. Gas fire-extinguishing apparatus
US20180119620A1 (en) * 2015-04-03 2018-05-03 Safran Helicopter Engines Flow limiter
US10337413B2 (en) * 2015-04-03 2019-07-02 Safran Helicopter Engines Flow limiter
CN105336317A (zh) * 2015-11-12 2016-02-17 佛山市顺德区键合电子有限公司 一种排氮消声器
WO2019060404A1 (en) * 2017-09-21 2019-03-28 DAO Health COMPACT SELF-CLEARING MUFFLER FOR BREAST EMPTY PUMPS
US20220082116A1 (en) * 2020-09-15 2022-03-17 Vortex Pipe Systems LLC Material flow modifier and apparatus comprising same
US11624381B2 (en) * 2020-09-15 2023-04-11 Vortex Pipe Systems LLC Material flow modifier and apparatus comprising same
CN113531267A (zh) * 2021-05-26 2021-10-22 朱梦楠 一种环保消音器

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CN101652539A (zh) 2010-02-17
JP4954297B2 (ja) 2012-06-13
KR100755722B1 (ko) 2007-09-05
EP2134937A1 (en) 2009-12-23
WO2008108538A1 (en) 2008-09-12
EP2134937A4 (en) 2017-06-14
CN101652539B (zh) 2013-04-24
ES2691706T3 (es) 2018-11-28
EP2134937B1 (en) 2018-08-29
JP2010520509A (ja) 2010-06-10

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