GB1417256A - Silencer - Google Patents

Silencer

Info

Publication number
GB1417256A
GB1417256A GB2705773A GB2705773A GB1417256A GB 1417256 A GB1417256 A GB 1417256A GB 2705773 A GB2705773 A GB 2705773A GB 2705773 A GB2705773 A GB 2705773A GB 1417256 A GB1417256 A GB 1417256A
Authority
GB
United Kingdom
Prior art keywords
strata
diaphragm
gas
apertures
aperture
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
GB2705773A
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.)
BBC Brown Boveri AG Switzerland
BBC Brown Boveri France SA
Original Assignee
BBC Brown Boveri AG Switzerland
BBC Brown Boveri France SA
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 BBC Brown Boveri AG Switzerland, BBC Brown Boveri France SA filed Critical BBC Brown Boveri AG Switzerland
Publication of GB1417256A publication Critical patent/GB1417256A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • H01H33/58—Silencers for suppressing noise of switch operation
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Fluid Mechanics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Exhaust Silencers (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

1417256 Exhaust silencers BROWN BOVERI & CIE AG 6 June 1973 [5 Aug 1972] 27057/73 Addition to 1358775 Heading F1B [Also'in Division H1] A silencer for use with a gas-blast circuit breaker comprises a cup-shaped rubber-elastic diaphragm 1 provided with two contiguous strata 3, 4 and formed with a plurality of funnel-shaped apertures 2 in the underside region of a bulbous projecting annular portion 12, the apertures in the two strata being offset with respect to one another and the strata being so constructed that they lift from another by an amount b, Fig. 3, to permit the relatively slow escape of blast gas, via the tortuous paths 6, from the outlet 20 of a discharge valve 18 which is enclosed by the diaphragm. The apertures are arranged in recurring groups spaced as in Fig. 4 (not shown) and each aperture has a rounded bead on the gas-entry side to improve gas flow. In Fig. 1 the diaphragm has an outwardly tunnel flange 10 for bolting to a support ring 22 and in an alternative embodiment, Fig. 2 (not shown), the bulbous projection is of a different shape and the rim of the diaphragm is attached directly to a collar on the support ring. Resilient expansion of the diaphragm as a whole initially absorbs energy from the gas discharge before the strata separate to allow gas release through the apertures 2 and in addition to attenuation decrement provided by the strata overall sound attenuation is achieved in a logarithmic manner from the overlap of the individual sound sources constituted by each aperture. The inner stratum 3 is heat resistant and the outer stratum 4 is resistant to bolt weather and atmospheric pollution.
GB2705773A 1972-08-05 1973-06-06 Silencer Expired GB1417256A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722238657 DE2238657B2 (en) 1972-08-05 1972-08-05 silencer

Publications (1)

Publication Number Publication Date
GB1417256A true GB1417256A (en) 1975-12-10

Family

ID=5852793

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2705773A Expired GB1417256A (en) 1972-08-05 1973-06-06 Silencer

Country Status (6)

Country Link
JP (1) JPS4945218A (en)
DE (1) DE2238657B2 (en)
FR (1) FR2195051B2 (en)
GB (1) GB1417256A (en)
IT (2) IT1045637B (en)
SE (1) SE379604B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2405666A (en) * 2003-09-05 2005-03-09 Dunlop Aerospace Ltd Noise attenuator, eg for turbofan engine air bleed system
US20180058619A1 (en) * 2015-01-21 2018-03-01 Deutsches Institut Fur Lebensmitteltechnik E.V. Sound absorber for vacuum grippers

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5645790A (en) * 1979-09-21 1981-04-25 Gadelius Kk Sea water desalting apparatus
JP6610154B2 (en) 2015-10-15 2019-11-27 Ｔｄｋ株式会社 Switch drive device and switch drive method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2128632C3 (en) * 1971-06-09 1973-10-18 Brown, Boveri & Cie Ag, 6800 Mannheim Silencer for high-voltage compressed gas switch

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2405666A (en) * 2003-09-05 2005-03-09 Dunlop Aerospace Ltd Noise attenuator, eg for turbofan engine air bleed system
US20180058619A1 (en) * 2015-01-21 2018-03-01 Deutsches Institut Fur Lebensmitteltechnik E.V. Sound absorber for vacuum grippers
US10794526B2 (en) 2015-01-21 2020-10-06 Deutsches Institut Fur Lebensmitteltechnik E.V. Sound absorber for vacuum grippers

Also Published As

Publication number Publication date
FR2195051A2 (en) 1974-03-01
JPS4945218A (en) 1974-04-30
IT1045632B (en) 1980-06-10
SE379604B (en) 1975-10-13
IT1045637B (en) 1980-06-10
DE2238657A1 (en) 1974-02-14
DE2238657B2 (en) 1974-08-08
FR2195051B2 (en) 1979-01-12
DE2238657C3 (en) 1975-06-12

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees