GB2536976A - De-rotators with added sound attenuation - Google Patents
De-rotators with added sound attenuation Download PDFInfo
- Publication number
- GB2536976A GB2536976A GB1505886.0A GB201505886A GB2536976A GB 2536976 A GB2536976 A GB 2536976A GB 201505886 A GB201505886 A GB 201505886A GB 2536976 A GB2536976 A GB 2536976A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sound
- volute
- rotating
- flat
- acoustic
- 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.)
- Withdrawn
Links
Classifications
-
- 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
- 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
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
- F04D29/664—Sound attenuation by means of sound absorbing material
-
- 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
- F16L55/02709—Throttle passages in the form of perforated plates
-
- 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
- F16L55/02745—Throttle passages by passing through a mass of particles or a porous member
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Pipe Accessories (AREA)
Abstract
A de-rotating volute with acoustic insulation provided by sound absorbing materials positioned on an internal wall of the volute. The insulation may be contained in an acoustically transparent material and arranged against the wall of the volute. It may also extend towards the volutes flow inlet, or beyond, into the connecting conduit. This extended insulation may be capped with an acoustic sound-reflective facing that may be either flat or a flattened dome.
Description
Intellectual Property Office Application No. GII1505886.0 RTM Date:21 October 2015 The following terms are registered trade marks and should be read as such wherever they occur in this document: Kevlar Intellectual Property Office is an operating name of the Patent Office www.gov.uk /ipo DE-ROTATORS WITH ADDED SOUND ATTENUATION.
1 This invention relates to adding to the inherent sound attenu-ating effect that de-rotating volutes produce upon the sound power content of spirally rotating fluids entering them. As such, this invention principally relates to attenuating the noise of internal combustion (i.c.) engine exhausts.
When i.c.engines, such as twin scroll turbo'ed engines and jet engines with both pre-rotating and de-rotating volutes, operate they will be less noisy than more conventional piston and jet i.c.engines. As would also be the case with any diesels having in their exhaust systems such inherently sound baffling devices as: a) centrifugal separators; b) centrifugal separator de-rotating volutes; c) turbo turbines, and d) turbo turbine de-rotating volutes.
However, such engine's exhausts are so fundamentally noisy that even with the inherent sound attenuation of their volutes, exhauSt turbo turbines, and separators, they will still be noisy -such that their exhaust systems would have silencer boxes, or longitudinal annular sound attennuators that involve cost and space requirements. To overcome these problems, or minimise them, the present invention proposes that de-rotating volutes' * .. flat internal faces, opposite their lateral flow connections, * * * be acoustically insulated faces, to, thereby, significantly in-e5 crease their sound attenuation by adding sound absorption to * thei inherent 'end-reflection' sound insertion loss, whilst only adding minimal frictional flow resistance -since flow velocities across said particular faces are relatively low (be-***.
ing zero at their centre) -and minimal extra depth to them *;*30 (doubling the depth of acoustic insulation less than doubles its attenuation). With such added attenuation (particularly in *the case of turbo diesels having de-rotated particulates sepa-* * * rators there would be, at least, two (2) sound attenuated de- * rotators, a sound baffling centrifugal separator and a sound * .35 attenuating turbo's exhaust turbine) silencer boxes might poss-ibly be omitted, or, at least be less baffled (reducing exhaust back-pressure) such as 'turbo' silencers are (turbos don't like back-pressure). To further increase sound attenuation other interior surfaces of such sound attenuating de-rotators could also be acoustically insulated faces, but would increase fric-tional flow resistance disproportionately since flow velocities across such surfaces would be somewhat higher. Attenuation can also be increased by excrescently extending the acoustically insulated face oposite the volutes flow inlet into the volute's void, and which could be part concave curved, or cylindrical, or combinations thereof, that could extend into, or beyond the said inlet, and have ends, or centres, that are acoustically non-transparent to tend-reflect sound) -preferably, and flat, or are bevelled thereof, or 'bull-nosed' to reduce flow resist-ance without unduly reducing acoustic end-reflection -since such excrescences are in the 'eye' of rotating flow/s their surface flow velocities are inherently relatively low such that their (additional) frictional flow resistances would be similarly low. IIt should be noted that sound does not spirally ro-tate, it simply radiates, bounces around and. in the process of radiating into molecules and bouncing off surfaces (both of which absorb some sound power), decays.] The invention will now be described solely by way of example and with reference to the accompanying artistic-Licence drawings in which: Figure 1 shows a cross section through a de-rotating volute having a recess on one (1) side containing acoustic sound-absorbing insulation material.
Figure 2 similarly shows an alternative sound attenuated de-rotating volute having a concave curved and 'bull-nosed' pod extending beyond its flow inlet.
In figure 1, de-rotating volute 1 has a recess 2 containing mineral wool acoustic insulation 3 faced with a heat resistant Kevlar membrane contained by perforated stainless steel facing 2C) 4 and spot welded to volute l's stainless steel casing. For non-high temperature applications the recess could simply be lined with rigid glass fibre faced with a material such as Revertex bonded to it (cut from slabs of such bonded together acoustic insulation) and affixed to the volute's casing (which could be galvanised steel) by epoxy glued-on duct pins having * sr* barbs to retain metal insulation retainers (where other non-* * **** * flat surfaces might also be desired to be acoustically insula- * ted, non-rigid insulation, retained by a second skin of perfor- * * ated steel, rather than duct pins, may be necessary -particu-larly for high velocity/high pressure applications).
In figure 2, de-rotating volute 5 has a recess 6 and contains a *** * concave curved excrescence 7 whose outer surfaces 8, apart from * its 'bull-nosed' (**) pod end 9, are acoustically semi-trans- * 035 parent (comprising a Kevlar membrane and perforated stainless * * * steel) containing mineral wool acoustic insulation 10. EA pod * with a streamlined, or pointed end would acoustically reflect * * significantly less sound than one with a 'bull-nose', such that total sound attenuation would be that much less than when 'bull-nosed', or, alternatively, flat and peripherally bevell-ed. (**) Semi-domed with a flat centre. SD O* *
Claims (4)
- CLAIMS: 1 1) A sound attenuated de-rotating volute in which it accommo-dates means for acoustically insulating one (1), or more, of its interior faces with one (1), or more, sound absorbing materials with, or without, facings.
- 2) A sound attenuated de-notating volute according to claim 1, in which at least some, or all of the accommodated acoustic insulation is restrained within an acoustically semi-transparent, or perforated, or permeable facing, or within a com-bination of them.
- 3) A sound attenuated de-rotating volute according to claim 1, or claim 2, in which the accommodated acoustic insulation extends, at least partly, into the volute's flow inlet, or beyond it -into its connected device, or conduit.
- 4) A sound attenuated de-rotating volute according to claim 3, in which the extended acoustic insulation is terminated with an acoustic sound-reflecting facing.* * 5) A sound attenuated de-rotating volute according to claim 4, in which the said termination is flat, or flat and peripherally bevelled, or 'bull-nosed' (i.e. semi-domed with a flat centre). * * * O0 * * * * **** * *** ** um * * * 0 0 * * * * * *
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1505886.0A GB2536976A (en) | 2015-04-04 | 2015-04-04 | De-rotators with added sound attenuation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1505886.0A GB2536976A (en) | 2015-04-04 | 2015-04-04 | De-rotators with added sound attenuation |
Publications (2)
Publication Number | Publication Date |
---|---|
GB201505886D0 GB201505886D0 (en) | 2015-05-20 |
GB2536976A true GB2536976A (en) | 2016-10-05 |
Family
ID=53190257
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1505886.0A Withdrawn GB2536976A (en) | 2015-04-04 | 2015-04-04 | De-rotators with added sound attenuation |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2536976A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20220096703A1 (en) * | 2020-09-27 | 2022-03-31 | Trane Air Conditioning Systems (China) Co., Ltd. | Photocatalytic oxidation centrifugal fan |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0886587A (en) * | 1994-09-16 | 1996-04-02 | Mitsubishi Heavy Ind Ltd | Heat exchanger |
JP2000205199A (en) * | 1999-01-18 | 2000-07-25 | Ishikawajima Harima Heavy Ind Co Ltd | Turbo-charger |
KR20010047573A (en) * | 1999-11-22 | 2001-06-15 | 김교욱 | Noise reducing device for CNC machine |
EP1780398A1 (en) * | 2005-10-25 | 2007-05-02 | Hutchinson | Intake silencer for a turbo compressed engine |
GB2490563B (en) * | 2011-05-03 | 2015-07-22 | Peter John Bayram | Spiral energy recovery and flow pre-rotation for turbochargers, turbo-expansion valves, turbojets and marine propellers, etc |
-
2015
- 2015-04-04 GB GB1505886.0A patent/GB2536976A/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0886587A (en) * | 1994-09-16 | 1996-04-02 | Mitsubishi Heavy Ind Ltd | Heat exchanger |
JP2000205199A (en) * | 1999-01-18 | 2000-07-25 | Ishikawajima Harima Heavy Ind Co Ltd | Turbo-charger |
KR20010047573A (en) * | 1999-11-22 | 2001-06-15 | 김교욱 | Noise reducing device for CNC machine |
EP1780398A1 (en) * | 2005-10-25 | 2007-05-02 | Hutchinson | Intake silencer for a turbo compressed engine |
GB2490563B (en) * | 2011-05-03 | 2015-07-22 | Peter John Bayram | Spiral energy recovery and flow pre-rotation for turbochargers, turbo-expansion valves, turbojets and marine propellers, etc |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20220096703A1 (en) * | 2020-09-27 | 2022-03-31 | Trane Air Conditioning Systems (China) Co., Ltd. | Photocatalytic oxidation centrifugal fan |
US11779677B2 (en) * | 2020-09-27 | 2023-10-10 | Trane Air Conditioning Systems (China) Co., Ltd. | Photocatalytic oxidation centrifugal fan |
Also Published As
Publication number | Publication date |
---|---|
GB201505886D0 (en) | 2015-05-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |