US3623572A

US3623572A - Sound damping arrangement

Info

Publication number: US3623572A
Application number: US90915A
Authority: US
Inventors: Werner Mrosek
Original assignee: Individual
Current assignee: Individual
Priority date: 1970-02-19
Filing date: 1970-11-19
Publication date: 1971-11-30
Anticipated expiration: 1988-11-30
Also published as: JPS5329847B1; DE2007527A1

Abstract

A tubular element conveys fluid through a passage having an enlarged passage portion. Accommodated in the passage portion axially spaced from one another is a pair of plates each provided in the respective outer margin with a concentric annulus of apertures. An insert is accommodated between the plates and defines with the wall of the element an annular clearance. Its respective end faces face the plates and are each provided with recesses communicating with the clearance and with one of the apertures. A plurality of depressions are provided in the upstream one of the endfaces and register with respective apertures and a plurality of closing members are each received in one of the depressions closing the same except for a reduced cross-sectional area. Biasing means yieldably biases the respective closing member into closing position in which it resiliently closes partially the respectively associated aperture.

Description

United States Patent [72] Inventor Werner Mrosek 2,864,403 12/1958 Deily et a1 181/65 X Rheydterstrasse 134, 404 Neuss, Germany 2,919,719 1/1960 Boulet... 138/43 [21] Appl. No. 90,915 3,074,437 1/1963 Mercier 138/31 Flled 1970 Primary Examiner-Robert S. Ward, Jr. [45] Patented 1971 Altorne\'Michael S. Striker [32] Priority Feb. 19,1970 [33] Germany 1 P20 07 527-8 ABSTRACT: A tubular element conveys fluid through a passage having an enlarged passage portion. Accommodated in the assa e ortion axiall s aced from one another is a [54] SOUNP AR RANGEMENT pair of plate s e ch provided in the respective outer margin 11 clalms'anrawmg with a concentric annulus of apertures. An insert is accom- [52] U.S.Cl 181/47 A, modated between the p tes and defines wit the all of the I 181/36, 181/65, 138/3 ]38/43 element an annular clearance. lts respective end faces face the [51] lnt.Cl F161 55/04, plates and are each provided i h recesses mm i ing 7 F01 1/20 with the clearance and with one of the apertures. A plurality [50] Field of Search 181/47, 57, of depressions a e p o i ed n e up t eam o e of the end- 47.|, 64.2, 65, 35, 36.2, 36 4], 49, 36,4; 138/26 faces and register with respective apertures and a plurality of 30 31 42 43 closing members are each received in one of the depressions closing the same except for a reduced cross-sectional area. References Cited Biasing means yieldably biases the respective closing member UNITED STATES PATENTS into closing position in which it resiliently closes partially the 2,674,096 4/1954 Marshall 138/43 x respectively asmifled aPerme- 2.838,072 6/1958 Stumm 181/47 A PAIENTEUmJv 30 Ian saw 1 or 2 vL-a L E n R K mu N mm a PATENTEDNEW 30 |9Tl SHEET 2 [IF 2 INVENTOR Una/m 11min 1 SOUND DAMPING ARRANGEMENT BACKGROUND OF THE INVENTION The present invention relates generally to damping arrange ments, and more particularly to a sound damping arrangeof course, the assembly of such an arrangement is difficult and complicated effectiveness of this ar- SUMMARY OF THE INVENTION It is, accordingly, an object of the present invention to overcome the aforementioned disadvantages of the art.

It is advantageous but not necessary that each of the apertures is associated with one of the depressions and with one of the closing members.

An arrangement constructed according to my invention as through nearly I". which occur in the nulii of apertures in the first-mentioned plates.

The closure members may be configurated as plugs of small paratively small or low pressure.

The novel features which are considered as characteristic for the invention are set forth in understood from the following description of specific embodiments when read in connection with the accompanying drawing.

FIG. 3 is a view similar to FIG. 1 but illustrating still another embodiment of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Discussing now the drawing in detail, and firstly the embodiv A, however, the members As FIG. 1 shows, there are accommodated in the passage portion Ia two plates 6 and 9 located at its opposite axial ends.

annulus 8 preferably corresponds at least substantially to the cross-sectional area of the passage portion 3. The same is true with respect to the passage portion of the combined crosssectional area of the apertures of the annulus 10. The plates 6 and 9 may be of one piece with the

tubular portions

2 and 4, respectively, and in the illustrated embodiment this is shown only for the plate 9 and the tubular portion 4. Such an arrangement is advantageous from a point of view of simplifying the production of the novel construction.

A space 11 downstream of the plate 9 in effect constitutes a collecting chamber in which the plurality of individual fluid streams are reunited before passing into the passage portion 5.

As FIG. I shows a solid insert 12 is accommodated intermediate the plates 6 and 9 and has an outer diameter smaller inner diameter of the passage portion la so that it defines with the wall of the portion 1 an annular channel 13 whose cross-sectional area according to a preferred embodiment of the invention corresponds at least substantially to the cross-sectional area of the passage portion 3.

The opposite axial end faces of the insert 12 face the

plates

6 and 14 so that only a portion 12a actually contacts the plate 6, whereby the apertures of the annulus 8 are free, that is they are not covered. Axial bores 16 are provided as illustrated which respectively register with apertures 18 which continuously displaces the closure member 17 to the broken line position shown. In the illustrated embodiment the members 17 are each provided with a bore 19 serving as a throttling bore and communicating with the hollow interior in which the spring 18 is located. The members 17 are guided in the respective recesses 16 in as friction-free a manner as possible so that they are slidable therein. 3

The essential point of the construction shown in FIG. 1 is that the space in the interior of the recesses 16 and not filled by the portion 17a of the member 17, is in communication with the spaces of the construction through which the liquid or gaseous medium flows through an aperture or opening 19 of reduced cross section, it being evident that the throttling bore 19 can also be replaced by grooves, channels or the like if desired. 7

least substantially corresponds to the cross-sectional area of the passage portion 3.

It will be appreciated that the broken line position of the member 17 shown in FIG. 1 will be the normal position when no fluid flows. When fluid flows in the direction of the arrow 17 are displaced to their full-line position without exerting any throttling effect on the flowing fluid. Due to the fact that the space upstream of the members 17 through which the medium flows with variable pressure, is in communication with the interior of the recesses 16 which is not filled by the portion 17a of the respective member 17, via the throttling bore 19, obtained between these two spaces so that the member 17 reciprocates to-and-fro in a phase-shifted relationship. This results in a strong reduction in the amplitudes of the exciter vibrations. Adding to this the fact that the medium is caused to change its direction of flow by the presence of the various plates, the liquid or gaseous medium passes through the passage portion 5 almost without pulsing and therefore almost without causing any further noise due to the production of vibrations.

A further embodiment is illustrated in FIG. 2. It differs from the embodiment of FIG. 1 only in the illustrated details so that the remainder of the illustration of FIG. 1 has been omitted as not essential for an understanding of the embodiment in FIG. 2. As will be seen, in FIG. 2 the members 17 have been replaced with closure members in form of diaphragms or membranes 22 configurated as a foldable diaphragm and a plate 23 connected with the diaphragm and provided with a throttling bore or aperture 19 which communicates with the interior of the respective recess 16. The spring 18 again serves the same purpose as described with respect to the embodiment of FIG. 1, urging the plate portion 23 into closing relationship against the apertures 8.

However, it will be appreciated that further modifications are also possible within the scope and intent of the present invention. It is for instance possible to produce the insert 12 not as a separate element, but as one piece with either the annular member 31, the portion 4, or with both. Such production can be by casting or the like. Particularly if the medium which flows through this construction is under high pressure and if circumstances generally are disadvantageous, it is possible to provide two or more of the arrangements in a single tubular sequence of the embodiments of FIGS. 1 and 2. Naturally, the construction according to the present invention need not be located downstream of the source of fluid, for instance a compressor, but could be built right into the source of fluid, that is be located within the physical confines of the same rather than in an exteriorly located tubular conduit.

It has also been found that the arrangement according to the present invention will operate satisfactorily even if the flow of fluid is in direction opposite to that which has been illustrated in FIG. 1. It is then only necessary to assure that the medium can act upon the respective closure members, for which puran arrangement is in form of an annular groove 24 provided in the plate 6 for the purpose of assuring that the medium can move to the respective members 17 from the lateral regions respective apertures 8 as is the case when the flow is in normal direction, that is the direction indicated by the arrow A.

Coming, finally, to the embodiment of FIG. 3 it will be seen that this is somewhat analogous to, but simpler than that of FIG. 1. The embodiment ofFIG. 3 may be used with particular advantage in applications where only relatively small fluidflow quantities are involved.

Like reference numerals identify like elements as those in FIG. I. Here, however, the plates of FIG. 1 have been omitted. Instead, the element 12 is provided with a single depression 16 in which the element 17 is slidably guided,

constitute therewith a unit to facilitate assembly and disassembly. The

members

30 and 32 have

apertures

31 and 33 which respectively communicate with the clearance 13 and the inlet 3 or the outlet 5 (via chamber 11), as the case may be. Although each member may have several apertures, particularly the member 32 may be provided with a single aperthrough opening coaxial with the inlet The operational principle of the FIG. 3 embodiment is the same as in H68. 1 and 2, i.e., the element or piston 17 compensates and smoothes out pressure variations in the fluid flow.

it will be understood that each of the elements described above, or two or more together, may also find a useful applicatron in other types of constructions differing from the types described above.

way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal ters Patent is set forth in the appended claims.

I claim:

1. A sound damping arrangement of the character respective concentric annuli of marginally located apertures; an insert accommodated said plates and defining wit depressions bein fluid bores 0 en at said upstream end face; and wherein sal closure mem ers are plugs slldably accommodated in respective ones of said bores.

6. A sound damping arrangement as defined in claim 2, said closure members being resiliently deflectable diaphragms 7. A sound damping arrangement as defined in claim 6, said diaphragms consisting at least predominantly of yieldably deflectable material.

8. A sound damping arrangement as defined in claim 6; further comprising supporting means for yieldably supporting outer margin.

1 l. A sound further comprising an annular groove connecting said recesses

Claims

1. A sound damping arrangement of the character described, comprising a fluid-conveying tubular element having a passage, including an enlarged passage portion through which fluid flows from an inlet to an outlet of said passage; an insert in said passage portion defining with the inner surface thereof an annular clearance intermediate said inlet and said outlet, said insert having an end face facing said inlet; a pair of apertured annular elements in said clearance at the upstream and downstream ends thereof, respectively; at least one depression in said end face and being juxtaposed with said inlet; at least one closing member juxtaposed with said inlet and closing said depression, said closing member having a surface facing the incoming fluid and provided with an aperture of reduced cross-sectional area communicating with the interior of said depression; and biasing means yieldably biasing said closing member to closing position tending to close said inlet.

2. A sound damping arrangement of the character described, comprising a fluid-conveying tubular element having a passage, including an enlarged passage portion, through which fluid flows in predetermined direction; a pair of plates in said passage portion axially spaced and provided with respective concentric annuli of marginally located apertures; an insert accommodated in said passage portion intermediate said plates and defining with the wall of said element an annular clearance, said insert having respective end faces adjacent said plates and provided with recesses each communicating with said clearance and with one of said apertures; a plurality of depressions in the upstream one of said end faces each registering with one of said apertures; a plurality of closing members each closing one of said depressions except for a reduced cross-sectional area; and biasing means yieldably biasing the respective closing members towards closing positions tending to close the respectively associated aperture.

3. A sound damping arrangement as defined in claim 2, wherein said plurality of depressions equal said plurality of apertures, and said plurality of closing members equal said plurality of depressions.

4. A sound damping arrangement as defined in claim 2, said passage having a predetermined cross-sectional area; and wherein each of the combined cross-sectional areas of said apertures of each of said annuli, of said recesses, of said depressions and of said annular clearance at least approximates said predetermined cross-sectional area.

5. A sound damping arrangement as defined in claim 2, said depressions being fluid bores open at said upstream end face; and wherein said closure members are plugs slidably accommodated in respective ones of said bores.

6. A sound damping arrangement as defined in claim 2, said closure members being resiliently deflectable diaphragms mounted in the respective depressions and deflectable into positions partially closing the respectively associated apertures.

7. A sound damping arrangement as defined in claim 6, said diaphragms consisting at least predominantly of yieldably deflectable material.

8. A sound damping arrangement as defined in claim 6; further comprising supporting means for yieldably supporting said diaphragms so that the same are yieldably deflectable.

9. A sound damping arrangement as defined in claim 2; and further comprising an annular member accommodated in said annular clearance and provided with an annulus of additional apertures concentric with the first-mentioned annuli.

10. A sound damping arrangement as defined in claim 9, said annular member having an outer margin, and said annulus of additional apertures being located in the region of said outer margin.

11. A sound damping arrangement as defined in claim 2; further comprising an annular groove connecting said recesses in the downstream one of said plates and having an open side facing towards said upstream plate.