GB1386288A - Silencers for pneumatic tools - Google Patents

Silencers for pneumatic tools

Info

Publication number
GB1386288A
GB1386288A GB3096572A GB3096572A GB1386288A GB 1386288 A GB1386288 A GB 1386288A GB 3096572 A GB3096572 A GB 3096572A GB 3096572 A GB3096572 A GB 3096572A GB 1386288 A GB1386288 A GB 1386288A
Authority
GB
United Kingdom
Prior art keywords
chambers
casing
air
chamber
orifices
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
GB3096572A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB1386288A publication Critical patent/GB1386288A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/11—Arrangements of noise-damping means
    • B25D17/12—Arrangements of noise-damping means of exhaust silencers
    • 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
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • 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
    • F01N1/06—Silencing apparatus characterised by method of silencing by using interference effect
    • 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
    • F01N1/083—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using transversal baffles defining a tortuous path for the gases or successively throttling gas flow
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/15—Plurality of resonance or dead chambers
    • F01N2490/155—Plurality of resonance or dead chambers being disposed one after the other in flow direction

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Exhaust Silencers (AREA)

Abstract

1386288 Silencers for pneumatic tools S WILMAN 3 July 1972 [5 July 1971] 30965/72 Heading B4C [Also in Division F1] A silencer for the exhaust of a pneumatic drill or the like comprises an outer casing 2, 3 which is adapted to surround the tool body 1 and has its internal cavity divided into a plurality of chambers 13, 13<SP>1</SP>, 14, 15, 16, 17, 18. Resonators are formed by the chambers 13, 13<SP>1</SP> connected to the chamber 14, adapted to receive exhaust air from the body orifice 20, by a tube 52 and openings 53, 54, respectively. At least one pair of successive chambers 14, 15 and 16, 17 through which the air flows in opposite directions are connected by a series of orifices (21 to 28), Fig. 3 (not shown), and (32 to 38), Fig. 5 (not shown), of increasing cross-sectional area in the direction of air flow in the upstream chamber to provide interference of the sound waves in the pair of chambers. The resonator 13 is tuned to the predominant frequency in the range from 0 to 1600 Hz. The reversal of air flow direction in successive chambers is effected by a partition 29 extending through the chambers and the provision, adjacent the partition, of outlet orifices (30, 30, 41, 42), Figs. 4 and 6 (not shown), from the downstream chamber of each pair. The air escapes from the casing 2, 3 through orifices 46, 47, 48 (43, 44, 45), Fig. 7 (not shown), which increase in cross-sectional area in the direction of air flow in the chamber 18 and produce sound wave interference. The casing may have two partitions 29 which define two series of successive communicating chambers adapted to receive exhaust air from at least two orifices in the body 1. A cylindrical sleeve of sheet metal may be fixed to the partitions 9 ... 12 to surround the body 1 and define therewith a resonance chamber or a path for air from chambers between the partitions. The casing 2, 3 may be formed of light alloy or rubber and may be of cylindrical, egg or vase shape or formed of two frusto-cones joined at their bases. The casing may be elliptical in cross-section.
GB3096572A 1971-07-05 1972-07-03 Silencers for pneumatic tools Expired GB1386288A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7124473A FR2144968A5 (en) 1971-07-05 1971-07-05

Publications (1)

Publication Number Publication Date
GB1386288A true GB1386288A (en) 1975-03-05

Family

ID=9079820

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3096572A Expired GB1386288A (en) 1971-07-05 1972-07-03 Silencers for pneumatic tools

Country Status (7)

Country Link
BE (1) BE785511A (en)
DE (1) DE2231617A1 (en)
FR (1) FR2144968A5 (en)
GB (1) GB1386288A (en)
IT (1) IT960145B (en)
NL (1) NL7209359A (en)
SE (1) SE404152B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2138728A (en) * 1983-04-22 1984-10-31 Inst Gornogo Dela Sibirskogo O Pneumatic impact tool
CN102892983A (en) * 2010-05-18 2013-01-23 格瑞克明尼苏达有限公司 Low ice pneumatic motor exhaust muffler

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4244442A (en) * 1978-10-13 1981-01-13 Rensselaer Polytechnic Institute Method and apparatus for treating exhaust gases particularly for air-operated tools
DE102010031071A1 (en) * 2010-07-07 2012-01-12 Wiwa Wilhelm Wagner Gmbh & Co Kg Pneumatic piston engine
CN109538331A (en) * 2018-12-24 2019-03-29 重庆凯罗尔机械配件有限公司 A kind of muffler

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2138728A (en) * 1983-04-22 1984-10-31 Inst Gornogo Dela Sibirskogo O Pneumatic impact tool
CN102892983A (en) * 2010-05-18 2013-01-23 格瑞克明尼苏达有限公司 Low ice pneumatic motor exhaust muffler

Also Published As

Publication number Publication date
SE404152B (en) 1978-09-25
IT960145B (en) 1973-11-20
FR2144968A5 (en) 1973-02-16
BE785511A (en) 1972-10-16
DE2231617A1 (en) 1973-01-18
NL7209359A (en) 1973-01-09

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee