Patent US3765354A successfully refreshed from Google Patents.
Patent US3894610A successfully refreshed from Google Patents.
US3894610A
Expired / Lapsed
US
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Gas stream silencer
Assignee: Burgess Manning Inc
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Filing: 1974-08-20
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Granted: 1975-07-15
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Expires: 1994-08-20
Abstract
Abstract Noise and noise potential in a gas stream are controlled by series step treatment, each step accomplishing diffusion and smoothing of the flow with overall absorption of sound. The first stage provides a sturdy shock absorbing cushion to receive and mitigate rough blast while subsequent stages successively moderate and smooth the flow of the gas stream and absorb sound energy. Design criteria maximize diffusion and sound absorption while avoiding the creation of secondary noises within the unit.
Inventors
- 👤 Edmund John Halter
- 👤 John Charles Lanpher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:25
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/18; F01N13/1838; F01N13/1844; F01N13/1855; F01N1/00; F01N1/08; F01N1/10; F01N13/009; F01N13/0097; F01N13/1805; F01N13/1811; F01N13/1888; F01N13/1894; F01N2310/00; F01N2310/02; F01N2450/00; F01N2450/24; F01N2470/00; F01N2470/02; F01N2490/00; F01N2490/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
194 words
In a plural stage gas stream silencer having circular shell means defining a plurality of treatment sections connected in series for the flow of a gas stream therethrough, each section having a central inlet opening therein and at least the side walls of the shell means having their internal surfaces covered with a layer of sound absorbing material held in position by perforated inner shell means; the improvement wherein a diffuser tube is mounted in each inlet opening and extends downstream therefrom into but not through the associated treatment section; each said tube being open at its upstream end, closed at its downstream end and having its side walls perforated; the distance from said perforated side walls to the perforated inner shell means surrounding the same being greateR than four times the diameter of the perforations in said side walls; the sound absorbing material of the layer surrounding said diffuser in the treatment section at the inlet end of the silencer consisting of a durable material such as metal turnings; the layer of sound absorbing material of succeeding treatment sections comprising material having high sound absorption capability such as punched hairfelt or glass fiber.
Claim 2
Dependent Claim
194 words
In a plural stage gas stream silencer having circular shell means defining a plurality of treatment sections connected in series for the flow of a gas stream therethrough, each section having a central inlet opening therein and at least the side walls of the shell means having their internal surfaces covered with a layer of sound absorbing material held in position by perforated inner shell means; the improvement wherein a diffuser tube is mounted in each inlet opening and extends downstream therefrom into but not through the associated treatment section; each said tube being open at its upstream end, closed at its downstream end and having its side walls perforated; the distance from said perforated side walls to the perforated inner shell means surrounding the same being greateR than four times the diameter of the perforations in said side walls; the sound absorbing material of the layer surrounding said diffuser in the treatment section at the inlet end of the silencer consisting of a durable material such as metal turnings; the layer of sound absorbing material of succeeding treatment sections comprising material having high sound absorption capability such as punched hairfelt or glass fiber.
Claim 3
Dependent Claim
38 words
Structure in accordance with claim 1 wherein the distance from the perforated side walls to the perforated inner shell means surrounding the same is from four to twenty times the diameter of the perforation in said side walls.
Claim 4
Dependent Claim
42 words
Structure in accordance with claim 1 and including a layer of vibration damping material surrounding the shell means defining the treatment section at the inlet end of the silencer to minimize the radiation of noise from said shell means to the atmosphere.
Claim 5
Dependent Claim
49 words
Structure in accordance with claim 1 wherein the shell means defining adjacent sections are connected together with resilient material sandwiched between and separating contiguous shell means structure whereby to minimize the transmission of vibration from the shell means of one section to the shell means of the adjacent section.
Claim 6
Dependent Claim
44 words
Structure in accordance with claim 4 wherein the joints connecting adjoining treatment sections comprise flanges mounted upon the respective shell means, a layer of resilient material arranged between said flanges, and fastening means drawing and holding the flanges together with said layer sandwiched therebetween.
Claim 7
Dependent Claim
50 words
Structure in accordance with claim 4 wherein the joint connecting adjoining treatment sections comprise spaced telescoping end portions of the shell means and a layer of resilient material filling the space between said telescoping end portions, and means fastening said telescoping end portions together with said resilient material sandwiched therebetween.
Claim 8
Dependent Claim
54 words
Structure in accordance with claim 1 wherein the outlet end of the final treatment section of the silencer is provided with means for connection thereto of an additional treatment section whereby the degree of treatment of the gas stream may be increased at some time after the initial installation and use of the silencer.
Claim 9
Dependent Claim
42 words
Structure in accordance with claim 1 and including a downstream extension of a diffuser tube, said extension having a layer of sound absorbing material exposed to the gas stream and defining with the inner shell an annular passageway for the gas stream.
Claim 10
Dependent Claim
22 words
Structure in accordance with claim 8 wherein the extension of the diffuser tube in in the final treatment section of the silencer.
Claim 11
Dependent Claim
31 words
Structure in accordance with claim 1 wherein the shell means in conical, the small end being the inlet end of the silencer and the large end being open to the atmosphere.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |