US4150696A
Expired / Lapsed
US
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Arrangement for suppressing vibrations caused by the flow of a flowable medium
Assignee: Max-Planck-Gesellschaft zur Förderung der Wissenschaften eV
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Filing: 1976-07-26
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Granted: 1979-04-24
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Expires: 1996-07-26
Abstract
Abstract A flow passage for a flowable medium is bounded by a wall, and located in e flow passage are one or more devices which suppress the occurrence of such flow conditions in the medium as would tend to cause the development of vibrations in the flowable medium and in the walls surrounding the flow passage.
Inventors
- 👤 Gerd E. A. Meier
- 👤 Winfried Hiller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:05
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/02; F16L55/027; F16L55/02763; F15; F15D; F15D1/00; F15D1/02; F16K; F16K47/00; F16K47/02; F16L55/02709; F16L55/02718; F16L55/02727; F16L55/02745; F02; F02B; F02B3/00; F02B3/06; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
175 words
In a fluid flow-through device, a combination comprising: first means defining a passage for conducting a stream of a fluid medium of a given kinematic viscosity v though the device; second means communicating with said first means and being disposed to impart fluctuations to said stream; and third means for controlling the flow characteristics of the medium to supress fluctuations in the stream, said third means including a first structure arranged within said passage downstream of said second means, said structure being permeable to the fluid medium and defining in its upstream portion a channel converging in the flow direction, a portion of said first structure surrounding said channel having a plurality of pairs of surfaces past which the medium flows at a speed u, said surfaces extending transversely with respect to the direction of flow, the surface in each pair being spaced from each other at a distance d which is determinative of the flow characteristics of the medium, said third means being operative for maintaining the Reynolds number Re=ud/v below 10 3 .
Claim 2
Dependent Claim
175 words
In a fluid flow-through device, a combination comprising: first means defining a passage for conducting a stream of a fluid medium of a given kinematic viscosity v though the device; second means communicating with said first means and being disposed to impart fluctuations to said stream; and third means for controlling the flow characteristics of the medium to supress fluctuations in the stream, said third means including a first structure arranged within said passage downstream of said second means, said structure being permeable to the fluid medium and defining in its upstream portion a channel converging in the flow direction, a portion of said first structure surrounding said channel having a plurality of pairs of surfaces past which the medium flows at a speed u, said surfaces extending transversely with respect to the direction of flow, the surface in each pair being spaced from each other at a distance d which is determinative of the flow characteristics of the medium, said third means being operative for maintaining the Reynolds number Re=ud/v below 10 3 .
Claim 3
Dependent Claim
76 words
A combination as defined in claim 1, wherein said second means is a throttle opening, said third means including a second structure having a pair of juxtaposed plates each formed with a row of wedge-shaped teeth disposed in said throttle opening upstream of said first structure, and spaced in direction transversely of said throttle opening, and means for moving said plates towards and away from each other so as to vary area of said throttle opening.
Claim 4
Dependent Claim
66 words
A combination as defined in claim 2, wherein one of said plates has a first row of teeth defining spaces between successive ones of the latter, and wherein the other of said plates as a second row of teeth offset from said first row so as to be received in said spaces of said first row when said varying means moves said plates towards each other.
Claim 5
Dependent Claim
34 words
A combination as defined in claim 1, wherein said first structure comprises a plurality of transverse portions extending between the two surfaces of each pair so that the medium flows around said transverse portions.
Claim 6
Dependent Claim
22 words
A combination as defined in claim 1, wherein said two surfaces of each pair bound respective flow-through openings in said first structure.
Claim 7
Dependent Claim
30 words
A combination as defined in claim 1, wherein said distance d is selected to produce in the flowing medium a Reynolds number Re=ud/v which is on the order of 1.
Claim 8
Dependent Claim
43 words
A combination as defined in claim 1, wherein said third means comprises means for splitting said stream into a plurality of individual branch flows causing vibration frequencies which are acceptably different from the vibration frequency caused by said stream prior to such splitting.
Claim 9
Dependent Claim
17 words
A combination as defined in claim 1, wherein said second structure is an element of open-celled material.
Claim 10
Dependent Claim
14 words
A combination as defined in claim 8, wherein said material is a sinter material.
Claim 11
Dependent Claim
17 words
A combination as defined in claim 1, wherein said first structure comprises an element of fibrous wadding.
Claim 12
Dependent Claim
18 words
A combination as defined in claim 1, wherein said first structure comprises an element made of apertured material.
Claim 13
Dependent Claim
80 words
A combination as defined in claim 1, wherein said third means comprises a flow nozzle arranged in said flow passage and forming a flow path which is bounded by a circumferential surface and includes an inflow section and an outflow section which diverges continuously in the flow direction of said medium; and further comprising a suction source for exerting suction on said medium so as to cause the latter to adhere to said circumferential surface and flow along the same.
Claim 14
Dependent Claim
80 words
A combination as defined in claim 1, wherein said control means comprises a flow nozzle arranged in said flow passage and forming a flow path which is bounded by a circumferential surface and includes an inflow section and an outflow section which diverges continuously in the flow direction of said medium; and further comprising a pressure source for exerting pressure on said medium so as to cause the latter to adhere to said circumferential surface and flow along the same.
Claim 15
Dependent Claim
18 words
A combination as defined in claim 1, wherein said first structure comprises an element made of strand-shaped material.
Claim 16
Dependent Claim
16 words
A combination as defined in claim 1, and further comprising varying means for varying said distance.
Claim 17
Dependent Claim
24 words
A combination as defined in claim 15, wherein said first structure is deformable; and wherein said varying means is operative for effecting such deformation.
Claim 18
Dependent Claim
32 words
A combination as defined in claim 15, wherein said third means has a total cross-sectional flow-through area for said medium, and said varying means is operative for varying said total cross-sectional area.
Claim 19
Dependent Claim
28 words
A combination as defined in claim 1, wherein said first structure is composed of a plurality of individual parts which are each separately movable relative to said passage.
Claim 20
Dependent Claim
35 words
A combination as defined in claim 1, wherein said third means further comprises another structure composed of a plurality of connected arcuate elements which form with one another gaps for the flow of said medium.
Claim 21
Dependent Claim
34 words
A combination as defined in claim 1, wherein said third means further comprises another structure configurated as a spiral coil of tape material so positioned that said medium flows axially through said spiral coil.
Claim 22
Dependent Claim
43 words
A combination as defined in claim 20, wherein said spiral coil is formed of two elastically distendable superimposed tapes which are connected along their respective longitudinal edges to form an enclosed interior space; and a source of pressure medium connected with said space.
Claim 23
Dependent Claim
33 words
A combination as defined in claim 21, wherein said spiral coil has its interior space subdivided into a plurality of chambers which are arranged successively along the longitudinal axis of said spiral coil.
Claim 24
Dependent Claim
43 words
A combination as defined in claim 20, wherein said tape material has an inner end and an outer end, one of said ends being immovable and the other of said ends being movable circumferentially of said coil to tighten or loosen the latter.
Claim 25
Dependent Claim
42 words
A combination as defined in claim 1, wherein said mechanical structure has at least one elastically yieldable tube defining in said passage a flow-through cross-section which varies in response to elastic yielding of the tube wall upon application thereto of requisite pressure.
Claim 26
Dependent Claim
15 words
A combination as defined in claim 24, wherein said tube is of substantially lenticular cross-section.
Claim 27
Dependent Claim
37 words
A combination as defined in claim 25, wherein said cross-section of said tube has one edge facing in the flow-direction of said medium; and wherein said other structure comprises plate-like extension portions projecting from said one edge.
Claim 28
Dependent Claim
47 words
A combination as defined in claim 1, wherein said third means further comprises another structure which forms a plurality of wedge-shaped compartments through which said medium flows, alternate ones of said compartments having their wedge-shaped interiors respectively converging and diverging in the flow-direction of said flowable medium.
Claim 29
Dependent Claim
32 words
A combination as defined in claim 27, wherein said compartments are formed at least in the region of their narrowest cross section with gaps communicating with the exterior of the respective compartment.
Claim 30
Dependent Claim
60 words
A combination as defined in claim 27, wherein said other structure comprises a stack of dished springs each having a concave side, said dished springs being arranged in pairs of springs which have their dished sides facing one another and form said compartments, and said medium flowing through said stack in direction from the center thereof in radially outward direction.
Claim 31
Dependent Claim
27 words
A combination as defined in claim 29, wherein said dished springs each have a central opening and a plurality of slots radiating outwardly from said center opening.
Claim 32
Dependent Claim
40 words
A combination as defined in claim 27, wherein said third means further comprises an additional structure located in said passage and having dimensions selected to produce in the flowing medium a Reynolds number which is smaller than 10 4 .
Claim 33
Dependent Claim
21 words
A combination as claimed in claim 1, wherein said first structure is located in a downstream diverging part of said passage.
Claim 34
Dependent Claim
37 words
A combination as defined in claim 1, wherein said second means has a throttle opening formed with a length dimension and a width dimension, and further comprising varying means for varying at least one of said dimensions.
Claim 35
Dependent Claim
17 words
A combination as defined in claim 33, wherein said channel converges in downstream direction towards a point.
Claim 36
Dependent Claim
32 words
A combination as defined in claim 1, wherein said second structure comprises a control member extending into said wedge-shaped channel and converging in downstream direction so as to form a throttle opening.
Claim 37
Dependent Claim
33 words
A combination as defined in claim 35, and further comprising means for moving said control member towards and away from said first structure so as to vary the size of said throttle opening.
Claim 38
Dependent Claim
27 words
A combination as defined in claim 35, wherein said control member has a star-shaped cross-sectional configuration in said converging channel in direction transverse to the downstream direction.
Claim 39
Dependent Claim
24 words
A combination as defined in claim 35, wherein the cross-sectional configuration of said control member corresponds to the cross-sectional configuration of said converging channel.
Claim 40
Dependent Claim
35 words
A combination as claimed in claim 1, wherein said first structure is composed of a plurality of parts arranged in a sequence in the flow direction, said distance being different for each of said parts.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |