GB771272A - Acoustic absorber - Google Patents

Acoustic absorber

Info

Publication number
GB771272A
GB771272A GB2077755A GB2077755A GB771272A GB 771272 A GB771272 A GB 771272A GB 2077755 A GB2077755 A GB 2077755A GB 2077755 A GB2077755 A GB 2077755A GB 771272 A GB771272 A GB 771272A
Authority
GB
United Kingdom
Prior art keywords
conduit
blades
sound
helical
helical member
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.)
Expired
Application number
GB2077755A
Inventor
Jordan J Baruch
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.)
Bolt Beranek and Newman Inc
Original Assignee
Bolt Beranek and Newman Inc
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 Bolt Beranek and Newman Inc filed Critical Bolt Beranek and Newman Inc
Priority to GB2077755A priority Critical patent/GB771272A/en
Publication of GB771272A publication Critical patent/GB771272A/en
Expired legal-status Critical Current

Links

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
    • F01N1/12—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using spirally or helically shaped channels
    • F01N1/125—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using spirally or helically shaped channels 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

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Exhaust Silencers (AREA)

Abstract

771,272. Silencers for air &c. currents. BOLT BERANEK and NEWMAN, Inc. July 18, 1955, No. 20777/55. Class 7 (2). The only path, which is helical in form, for the flow of a fluid medium through an acoustically-absorbent conduit is provided by a helical member mounted within and along at least a portion of the conduit and peripherally bounded by the conduit. As shown in Fig. 1, the conduit 1, of metal or ceramic and preferably of circular cross-section, may form part of a silencer, an air-conditioning duct, a test cell for turbo-jet engines or any other fluid-carrying passageway and has a lining 3 of felt, rock-wool, fibre-glass or any other sound-absorbing material. A number of blades 5, 7, 9 disposed transversely of and at an acute angle to the longitudinal axis of the conduit are mounted upon a rod support 11 held in position preferably along the axis of the conduit, by one or more mounting rings 13 each provided with a number of struts 15; each blade overlaps the adjacent blade to provide a helical path between the blades and the blades touch or nearly touch the lining 3. In modifications (a), Fig. 2 (not shown), the pitch of the blades is increased, and (b) Fig. 3 (not shown) instead of separate blades 5, 7, 9 a continuous helical member is used. In further modifications, the blades 5, 7, 9, Fig. 4, or helical member, are provided with a layer 19 of fibre-glass, or other sound-absorbent material, and a perforated metallic facing 29. The conduit 1 may be fabricated from sound-absorbing material. Specification 721,860 is referred to.
GB2077755A 1955-07-18 1955-07-18 Acoustic absorber Expired GB771272A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2077755A GB771272A (en) 1955-07-18 1955-07-18 Acoustic absorber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2077755A GB771272A (en) 1955-07-18 1955-07-18 Acoustic absorber

Publications (1)

Publication Number Publication Date
GB771272A true GB771272A (en) 1957-03-27

Family

ID=10151512

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2077755A Expired GB771272A (en) 1955-07-18 1955-07-18 Acoustic absorber

Country Status (1)

Country Link
GB (1) GB771272A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006033557A1 (en) * 2004-09-24 2006-03-30 Lee Seok Hyeon Device for preventing noise in a drain pipe
CN110792869A (en) * 2019-11-20 2020-02-14 延安大学 Pipeline voltage stabilizing equipment and voltage stabilizing method thereof
CN113738989A (en) * 2021-08-31 2021-12-03 唐山建龙简舟钢铁有限公司 Spiral-flow type silencer
CN114321550A (en) * 2021-11-22 2022-04-12 太原理工大学 Spiral ladder type energy dissipation device suitable for pressure pipeline

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006033557A1 (en) * 2004-09-24 2006-03-30 Lee Seok Hyeon Device for preventing noise in a drain pipe
CN110792869A (en) * 2019-11-20 2020-02-14 延安大学 Pipeline voltage stabilizing equipment and voltage stabilizing method thereof
CN113738989A (en) * 2021-08-31 2021-12-03 唐山建龙简舟钢铁有限公司 Spiral-flow type silencer
CN114321550A (en) * 2021-11-22 2022-04-12 太原理工大学 Spiral ladder type energy dissipation device suitable for pressure pipeline

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