CA2245069A1 - Ultrasonic attenuator - Google Patents
Ultrasonic attenuator Download PDFInfo
- Publication number
- CA2245069A1 CA2245069A1 CA 2245069 CA2245069A CA2245069A1 CA 2245069 A1 CA2245069 A1 CA 2245069A1 CA 2245069 CA2245069 CA 2245069 CA 2245069 A CA2245069 A CA 2245069A CA 2245069 A1 CA2245069 A1 CA 2245069A1
- Authority
- CA
- Canada
- Prior art keywords
- zone
- disposed
- perforated
- case
- flow
- 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.)
- Abandoned
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
- F16L55/027—Throttle passages
- F16L55/02709—Throttle passages in the form of perforated plates
- F16L55/02727—Throttle passages in the form of perforated plates placed parallel to the axis of the pipe
Abstract
The invention is a device for ultrasonic attenuation for piping through which a gaseous medium is flowing. The device consists of a case adapted to be inserted into the pipe, and includes a flow inlet and a flow outlet. Plate-shaped elements presenting perforations are disposed extending parallel to one another between the zone of flow inlet and the zone of flow outlet.
Description
P10505 S/wil 27 July 1998 Applicant: Mueller-BBM GmbH
Robert-Koch-Strasse 8215~ Planegg Ultr~onlc Attenuator The invention relate~ to a ~evice for ultra~onic attenuation for a piping or tubing through which a gaseous medium i~
flowing.
For mea~uring the flow-rate of a gaseou~ medium such a~ natural gas in piping ultra~onic gas metere are employed to an ever-in-creasing extent. The~e ultrasonic meters benefit fro~ the fact that the ultraeonic pul~e3, which operate in a range from roughly 60 to 200 kHz, propagate at a hig~er rate in the down-~tream direction and at a lower rate in the upstream direction.
At these frequencie~ the acoustic waves have lengths o~ less than 6 mm.
One problem in the application of an ultra~onic gas me~er con-sists in the ~act that the u~eful sound i~ concealed by inter-ferin~ noiee. Noi~e 80~rce~ ~uch as fittinge, compre~ore or fans, which supply the ~ound ~ithin a frequency range used by the gas meter, account for the occurrence of ~uch interfering noi~e. Accordingly there is the need for trouble-free operation of an ultrasonic ga~ meter in piping that an ultra~onic at-tenuator will be mounted ahead and down~trea~ of the ultrasonic ga~ meter, which attenuates sound wave~ ha~ing wave length~ of le~ than 6 mm. At the same time the aspect muqt al~o be duly considered, on account of the ~hort sound wave lengths, that avoidance of soiling ie an essential prerequisite for the func-tional integr~ty of the ultra~onic attenuator a~ ~uch.
From application6 in other frequency range~ the pro~i~ion of ~ound-ab~orbing deflector~ in the for~ of a pipe manifold hav-ing an absorbing lining i~ known. ~hat haq turned out a~ disad-vantage in the applicat~on within the ultrasonic range, how-ever, is a high risk of 60iling. r~loreover such a ~ound-attenu-ating provislon requires extended fitting di~en~ions which re-~ult i~ expen~ive solution~.
The invention i~ now ba~ed on the problem of making an effi-cient ultrasonic attenuator device available for piping through which a gaseou~ medium ic flowing, which presents a ~imple com-pact ~tructure with a low 90iling rick.
In accordance with the invention thi~ problem i~ ~olved by the features defined in Claim 1. Preferred feature~ defining expe-dient improve~ents of the lnvention may be derived from the de-pendent Claims.
The invention hence expediently prop~ec an ultra~onlc attenua-tor device wherein, at a short fitting length, not only the ~oiling risk iB low but al~o the pressure 108e across the at-tenuator may be kept s~all. The inventive device allow~ for great reductions of the noise ievel.
The mutually parallel orienta~ion of the individual per~orated plates along the flow direction contributes to the ~en~itivity in terms of fioiling. The device can be de~igned ~ith an extraordinarily compact struc~ure including a tubular ca~e which may be mounted, even sub~equently, in exi9ting pip~ng, either directly or via a~sociated flanges. The device a~ such preferably consist~ of corroeion-re~i~tant ~pecial ~teel~.
~he thickne6s of the perforated plate is comparatively non-critical within the range between 60 and 200 kHz, and range~
appro~imately bet~een 0.5 and o mm, pre~erably between rou~hly 1 and 4 mm.
The perforated plate~ preferably present a uniform perforation pattern with constant diameters of ~he perforatione amounting to ~ 10 mm, preferably S 6 Inm; it E~hould be noted that 80iling cannot be precluded in the case of s~aller hole diameters.
A~ far as the ~ize of the distance bet~een adjacent perforated plate~ 1~ concerne~ this distance mu~t be presumed to be a functlon of both the dl~ance from the associated ultrasonic ga~ meter, on the one hand, and o~ the configuration of the ~ound ~ource a~d the length of the sound wave~, on the other hand. The di~tance between adj acent perforated plate6 should not amount to more than two timee the length of the ~ound waves oE the ultra60nic meter, e.g. roughly 8 mm at a frequency of 1~0 kHz.
The length of the tubular case amounts to roughly 200 mm in or-der to achieve an in~ertion loe~ of 20 dB. Shorter and longer de~ign~ are, of course, possible, too, and it i~ equally poss~-ble to couple several device~ in tandem arrangement, in w~ich ca-~e, however, the orlentation of the per~orated plates of the ~ir-s~ device shouLd be normal on the exteneion of the pe~fo-rated plate~ of the other dev$ce.
A~ far as .he diameter of the tubular ca~e i~ concerned ap-proximate sizeY from 100 to loO0 mm are preferred, depending on the application, e.g. in nat~ral ga~ pipes and piping~ of any type through ~hich gas i8 ~1Owing.
Regarding the three-dimen~ional orientation ~f the perforated plate~ it i~ moreover expedient to di~pose them vertically in the ca~e becau~e ~uch an arrangement i9 al~o accompanied by a further reduction of the ~oiling ri~k.
The inventive concept, which provide~ for absorption by a com-bination of a flo~ attenuation and a A/4-re~onator, allow~ for a ~hort-length and hence compact device wherein the generation of new ~ound waves in the devlce a~ such at the perforated plate6 ifi expediently avoided in an e~ficient and reliable manner by the provi~ion that the flow arri~es at the face of the per~orated ~heet3 only rather than flowing through the perforated area. This achieve~ also the advantageou~ aspect that only a ~mall pressure los~ i~ created across the ultrasonic attenuator device.
In the following, the invention will be explained in more de-tail~ ~ith reference to the attached drawings. In the drawings:
Fig. 1 i~ a plan view of the face of one embodi~ent of an ul-tra~onic attenuator device;
Fig. 2 show~ a sectional view taken along the line II - II ln Fig. 1, and Fig. ~ i6 a ~ectional plan view of another embodimen~ of the inventive device in ccrre~pondence with Figure 1.
Figure 1 shows a device 10 for ultra~onic attenuation, which compri~e~ a case 11 in the for~ of a hollow cylinder ha~ing a diameter o~ roughly 200 mm in one embodiment and a length of roughly 15~ mm according to Figure 2,. The ca~e 11 ls provided with a flow inlet 12 and a flow outlet 13. The direction of flow i~ indicated ~y the arrow~ A in Figure 2.
In the case 11 numerous perforated plate~ or perforated sheets 14, re~pectively, are dispoeed in mutually parallel arrange-ment, which e~tend between the zone of the flow inlet 12 and the zone of the flow outlet 13 in parallel to each other. In the illustrated em~odiment they are flush with the case 1~ at the inlet and outlet sides.
The perforated ~heet~ 14 are dieposed in vertical arrangement in the ca6e 11 and pre~ent a uniform perforation pattern with hole~ ~5 of con~tant diametere of perforation, which are le~
than 6 mm in ~he illustrated embodiment.
The thickness d of the perforated plate~ 14 amounte to roughly 3 mm in ~he illu~trated e~bodiment.
The ~ize of the ~pacing a between adjacent per~orated p~ates 14 amounts to 4 mm, approximately.
The device con~i~t~ of a corrosion-re~istant ~teel. The perforated sheet~ 14 are mounted in the hollow cylinder of the ca~e 13 by welding, and the case 11 i~ then either in~erted into and fa~tened in an existing pipe 20 or it i~ mounted via lateral flange~, which are not illu~trated here, po~ibly in a flared pipe ~ection so a~ to avoid an exce~ive pres~ure lo~.
In accorda..ce ~ith Figures 1 and 2 the inventive device 10 for ultrasonic attenuation consi6t~ of an arrangement of perforated disks 14 which are arranged in parallel with each other. The liquid ~lows through the de~ice in parallel with the perforated di~k~ 14. In this type of device sound noise components in the audible range may be created from a certain flow rate onwards, and hence result in an unde~irable noi~e nui~ance. The ef fi-ciency of the device for ule~a~onic attenuation (level reduc-tlon in the ultra~onic range) i8 not impaired,~hereby~however~
With reference to Fi~ure 3 now a modified embodiment o~ the in-ventive device will be de~cribed. The inventive device accord-ing to Figu-e 3 include~ perforated di~k~ or ~heet~ 14, re~pec-tively, which are di~po~ed in parallel with each other, as ha~
been described ~ith reference to Figure 1. S~pplementing the embodiment accordlng to Figure 1, non-perforated disks ~2 are inserted in addition to the perforated disks 14, which are in-tegrated into the hollow cylinder of the ca~e 11. As i8 evident from Figure 3, preferably one non-perforated disk 22 i8 pro-vided to join every two or three perforated di~k~ 14 in the em-bodiment illu8trated there, ~hich non-perforated disk i8 joined again by another two or three perforated di~ks 14. The perfora-tions in the perforated sheet~ 14 are identified - in corre-~pondence with Figure 1- with reference numeral 15 in Figure 3.
All of the disks 14, 22 are arranged in parallel with each other and in parallel with the axis of the ca3e ll. In the em-bodiment illu~trated in Figure 3, etarting out from the left end, first two perforated di~ks and then one non-perforated di~k 22, finally three perforated diske 14, one non-perforated di~k 22 and again two perforated di~ks 14 are di3po~ed. If ~ec-e~ary, the ~tructure, i.e. the in~ertion of the non-perforated disk~ 22, may be appropriately varied. The perforated ~heets and the non-perforated ~heets (14, 22) are fa~tened oppo~ite to the ca~e 11 li~e in the embodiment according to Figures 1 and 2.
With the device illustra_ed in Figure 3 ~ound noi~e component~
in the audible range ~ay be avoided, by contra~t to the device according to Figures 1 and 2.
Robert-Koch-Strasse 8215~ Planegg Ultr~onlc Attenuator The invention relate~ to a ~evice for ultra~onic attenuation for a piping or tubing through which a gaseous medium i~
flowing.
For mea~uring the flow-rate of a gaseou~ medium such a~ natural gas in piping ultra~onic gas metere are employed to an ever-in-creasing extent. The~e ultrasonic meters benefit fro~ the fact that the ultraeonic pul~e3, which operate in a range from roughly 60 to 200 kHz, propagate at a hig~er rate in the down-~tream direction and at a lower rate in the upstream direction.
At these frequencie~ the acoustic waves have lengths o~ less than 6 mm.
One problem in the application of an ultra~onic gas me~er con-sists in the ~act that the u~eful sound i~ concealed by inter-ferin~ noiee. Noi~e 80~rce~ ~uch as fittinge, compre~ore or fans, which supply the ~ound ~ithin a frequency range used by the gas meter, account for the occurrence of ~uch interfering noi~e. Accordingly there is the need for trouble-free operation of an ultrasonic ga~ meter in piping that an ultra~onic at-tenuator will be mounted ahead and down~trea~ of the ultrasonic ga~ meter, which attenuates sound wave~ ha~ing wave length~ of le~ than 6 mm. At the same time the aspect muqt al~o be duly considered, on account of the ~hort sound wave lengths, that avoidance of soiling ie an essential prerequisite for the func-tional integr~ty of the ultra~onic attenuator a~ ~uch.
From application6 in other frequency range~ the pro~i~ion of ~ound-ab~orbing deflector~ in the for~ of a pipe manifold hav-ing an absorbing lining i~ known. ~hat haq turned out a~ disad-vantage in the applicat~on within the ultrasonic range, how-ever, is a high risk of 60iling. r~loreover such a ~ound-attenu-ating provislon requires extended fitting di~en~ions which re-~ult i~ expen~ive solution~.
The invention i~ now ba~ed on the problem of making an effi-cient ultrasonic attenuator device available for piping through which a gaseou~ medium ic flowing, which presents a ~imple com-pact ~tructure with a low 90iling rick.
In accordance with the invention thi~ problem i~ ~olved by the features defined in Claim 1. Preferred feature~ defining expe-dient improve~ents of the lnvention may be derived from the de-pendent Claims.
The invention hence expediently prop~ec an ultra~onlc attenua-tor device wherein, at a short fitting length, not only the ~oiling risk iB low but al~o the pressure 108e across the at-tenuator may be kept s~all. The inventive device allow~ for great reductions of the noise ievel.
The mutually parallel orienta~ion of the individual per~orated plates along the flow direction contributes to the ~en~itivity in terms of fioiling. The device can be de~igned ~ith an extraordinarily compact struc~ure including a tubular ca~e which may be mounted, even sub~equently, in exi9ting pip~ng, either directly or via a~sociated flanges. The device a~ such preferably consist~ of corroeion-re~i~tant ~pecial ~teel~.
~he thickne6s of the perforated plate is comparatively non-critical within the range between 60 and 200 kHz, and range~
appro~imately bet~een 0.5 and o mm, pre~erably between rou~hly 1 and 4 mm.
The perforated plate~ preferably present a uniform perforation pattern with constant diameters of ~he perforatione amounting to ~ 10 mm, preferably S 6 Inm; it E~hould be noted that 80iling cannot be precluded in the case of s~aller hole diameters.
A~ far as the ~ize of the distance bet~een adjacent perforated plate~ 1~ concerne~ this distance mu~t be presumed to be a functlon of both the dl~ance from the associated ultrasonic ga~ meter, on the one hand, and o~ the configuration of the ~ound ~ource a~d the length of the sound wave~, on the other hand. The di~tance between adj acent perforated plate6 should not amount to more than two timee the length of the ~ound waves oE the ultra60nic meter, e.g. roughly 8 mm at a frequency of 1~0 kHz.
The length of the tubular case amounts to roughly 200 mm in or-der to achieve an in~ertion loe~ of 20 dB. Shorter and longer de~ign~ are, of course, possible, too, and it i~ equally poss~-ble to couple several device~ in tandem arrangement, in w~ich ca-~e, however, the orlentation of the per~orated plates of the ~ir-s~ device shouLd be normal on the exteneion of the pe~fo-rated plate~ of the other dev$ce.
A~ far as .he diameter of the tubular ca~e i~ concerned ap-proximate sizeY from 100 to loO0 mm are preferred, depending on the application, e.g. in nat~ral ga~ pipes and piping~ of any type through ~hich gas i8 ~1Owing.
Regarding the three-dimen~ional orientation ~f the perforated plate~ it i~ moreover expedient to di~pose them vertically in the ca~e becau~e ~uch an arrangement i9 al~o accompanied by a further reduction of the ~oiling ri~k.
The inventive concept, which provide~ for absorption by a com-bination of a flo~ attenuation and a A/4-re~onator, allow~ for a ~hort-length and hence compact device wherein the generation of new ~ound waves in the devlce a~ such at the perforated plate6 ifi expediently avoided in an e~ficient and reliable manner by the provi~ion that the flow arri~es at the face of the per~orated ~heet3 only rather than flowing through the perforated area. This achieve~ also the advantageou~ aspect that only a ~mall pressure los~ i~ created across the ultrasonic attenuator device.
In the following, the invention will be explained in more de-tail~ ~ith reference to the attached drawings. In the drawings:
Fig. 1 i~ a plan view of the face of one embodi~ent of an ul-tra~onic attenuator device;
Fig. 2 show~ a sectional view taken along the line II - II ln Fig. 1, and Fig. ~ i6 a ~ectional plan view of another embodimen~ of the inventive device in ccrre~pondence with Figure 1.
Figure 1 shows a device 10 for ultra~onic attenuation, which compri~e~ a case 11 in the for~ of a hollow cylinder ha~ing a diameter o~ roughly 200 mm in one embodiment and a length of roughly 15~ mm according to Figure 2,. The ca~e 11 ls provided with a flow inlet 12 and a flow outlet 13. The direction of flow i~ indicated ~y the arrow~ A in Figure 2.
In the case 11 numerous perforated plate~ or perforated sheets 14, re~pectively, are dispoeed in mutually parallel arrange-ment, which e~tend between the zone of the flow inlet 12 and the zone of the flow outlet 13 in parallel to each other. In the illustrated em~odiment they are flush with the case 1~ at the inlet and outlet sides.
The perforated ~heet~ 14 are dieposed in vertical arrangement in the ca6e 11 and pre~ent a uniform perforation pattern with hole~ ~5 of con~tant diametere of perforation, which are le~
than 6 mm in ~he illustrated embodiment.
The thickness d of the perforated plate~ 14 amounte to roughly 3 mm in ~he illu~trated e~bodiment.
The ~ize of the ~pacing a between adjacent per~orated p~ates 14 amounts to 4 mm, approximately.
The device con~i~t~ of a corrosion-re~istant ~teel. The perforated sheet~ 14 are mounted in the hollow cylinder of the ca~e 13 by welding, and the case 11 i~ then either in~erted into and fa~tened in an existing pipe 20 or it i~ mounted via lateral flange~, which are not illu~trated here, po~ibly in a flared pipe ~ection so a~ to avoid an exce~ive pres~ure lo~.
In accorda..ce ~ith Figures 1 and 2 the inventive device 10 for ultrasonic attenuation consi6t~ of an arrangement of perforated disks 14 which are arranged in parallel with each other. The liquid ~lows through the de~ice in parallel with the perforated di~k~ 14. In this type of device sound noise components in the audible range may be created from a certain flow rate onwards, and hence result in an unde~irable noi~e nui~ance. The ef fi-ciency of the device for ule~a~onic attenuation (level reduc-tlon in the ultra~onic range) i8 not impaired,~hereby~however~
With reference to Fi~ure 3 now a modified embodiment o~ the in-ventive device will be de~cribed. The inventive device accord-ing to Figu-e 3 include~ perforated di~k~ or ~heet~ 14, re~pec-tively, which are di~po~ed in parallel with each other, as ha~
been described ~ith reference to Figure 1. S~pplementing the embodiment accordlng to Figure 1, non-perforated disks ~2 are inserted in addition to the perforated disks 14, which are in-tegrated into the hollow cylinder of the ca~e 11. As i8 evident from Figure 3, preferably one non-perforated disk 22 i8 pro-vided to join every two or three perforated di~k~ 14 in the em-bodiment illu8trated there, ~hich non-perforated disk i8 joined again by another two or three perforated di~ks 14. The perfora-tions in the perforated sheet~ 14 are identified - in corre-~pondence with Figure 1- with reference numeral 15 in Figure 3.
All of the disks 14, 22 are arranged in parallel with each other and in parallel with the axis of the ca3e ll. In the em-bodiment illu~trated in Figure 3, etarting out from the left end, first two perforated di~ks and then one non-perforated di~k 22, finally three perforated diske 14, one non-perforated di~k 22 and again two perforated di~ks 14 are di3po~ed. If ~ec-e~ary, the ~tructure, i.e. the in~ertion of the non-perforated disk~ 22, may be appropriately varied. The perforated ~heets and the non-perforated ~heets (14, 22) are fa~tened oppo~ite to the ca~e 11 li~e in the embodiment according to Figures 1 and 2.
With the device illustra_ed in Figure 3 ~ound noi~e component~
in the audible range ~ay be avoided, by contra~t to the device according to Figures 1 and 2.
Claims (15)
1. Device for ultrasonic attenuation for piping through which a gaseous medium is flowing, consisting of a case adapted to be inserted into the pipe, including a flow inlet and a flow outlet and in which plate-shaped elements presenting perforations are disposed which extend in parallel with one another between the zone of said flow inlet and the zone of said flow outlet.
2. Device according to Claim 1, wherein said plate-shaped elements are designed as perforated plates.
3. Device according to Claim 1, wherein said plate-shaped elements are comprised of perforated parallel plates, which are disposed at a constant spacing.
4. Device according to Claim 1, wherein said plate-shaped elements are comprised of perforated parallel plates, which are disposed at a constant spacing, and wherein said perforated plates are disposed in said case in vertical arrangement.
5. Device according to Claim 1, wherein said plate-shaped elements are comprised of perforated parallel plates and wherein said perforated plates have a thickness which amounts to roughly 0.5 to 8 mm, preferably 1 to 4 mm, approximately.
6. Device for ultrasonic attenuation for piping through which a gaseous medium is flowing, consisting of a case adapted to be inserted into the pipe, including a flow inlet and a flow outlet and in which plate-shaped elements presenting perforations are disposed which extend in parallel with one another between the zone of said flow inlet and the zone of said flow outlet, wherein said plate-shaped elements are designed as perforated plates, and wherein said perforated plates present perforation patterns displaying constant diameters of perforation, which amount to ~ 10 mm, preferably ~ 6 mm.
7. Device for ultrasonic attenuation for piping through which a gaseous medium is flowing, consisting of a case adapted to be inserted into the pipe, including a flow inlet and a flow outlet and in which plate-shaped elements presenting perforations are disposed which extend in parallel with one another between the zone of said flow inlet and the zone of said flow outlet, wherein said plate-shaped elements are comprised of perforated parallel plates, which are disposed at a constant spacing, wherein the size of the spacing between adjacent perforated sheets corresponds to a maximum of twice the wave length of an ultrasonic meter to be protected by the device or is matched with the configuration of the sound sources, inclusive of the sound wave length, and preferably amounts to ~ 10 mm.
8. Device according to Claim 1, wherein said case presents a tubular configuration.
9. Device for ultrasonic attenuation for piping through which a gaseous medium is flowing, consisting of a case adapted to be inserted into the pipe, including a flow inlet and a flow outlet and in which plate-shaped elements presenting perforations are disposed which extend in parallel with one another between the zone of said flow inlet and the zone of said flow outlet, wherein said case presents a tubular configuration, wherein said tubular case has a diameter of roughly 100 to roughly 1000 mm and a length of 150 mm to 200 mm approximately.
10. Device for ultrasonic attenuation for piping through which a gaseous medium is flowing, consisting of a case adapted to be inserted into the pipe, including a flow inlet and a flow outlet and in which plate-shaped elements presenting perforations are disposed which extend in parallel with one another between the zone of said flow inlet and the zone of said flow outlet, wherein said case is adapted to be mounted in said pipe.
11. Device for ultrasonic attenuation for piping through which a gaseous medium is flowing, consisting of a case adapted to be inserted into the pipe, including a flow inlet and a flow outlet and in which plate-shaped elements presenting perforations are disposed which extend in parallel with one another between the zone of said flow inlet and the zone of said flow outlet, wherein said case is adapted to be mounted in said pipe, wherein said case is disposed in a preferably flared tube section by means of connecting flanges.
12. Device for ultrasonic attenuation for piping through which a gaseous medium is flowing, consisting of a case adapted to be inserted into the pipe, including a flow inlet and a flow outlet and in which plate-shaped elements presenting perforations are disposed which extend in parallel with one another between the zone of said flow inlet and the zone of said flow outlet, wherein said case comprises at least one non-perforated sheet.
13. Device for ultrasonic attenuation for piping through which a gaseous medium is flowing, consisting of a case adapted to be inserted into the pipe, including a flow inlet and a flow outlet and in which plate-shaped elements presenting perforations are disposed which extend in parallel with one another between the zone of said flow inlet and the zone of said flow outlet, wherein said case comprises at least one non-perforated sheet, wherein said one non-perforated sheet is disposed each to join a group of perforated sheets.
14. Device for ultrasonic attenuation for piping through which a gaseous medium is flowing, consisting of a case adapted to be inserted into the pipe, including a flow inlet and a flow outlet and in which plate-shaped elements presenting perforations are disposed which extend in parallel with one another between the zone of said flow inlet and the zone of said flow outlet, wherein said case comprises at least one non-perforated sheet, wherein each non-perforated sheet is disposed in parallel with said perforated sheets.
15. Device for ultrasonic attenuation for piping through which a gaseous medium is flowing, consisting of a case adapted to be inserted into the pipe, including a flow inlet and a flow outlet and in which plate-shaped elements presenting perforations are disposed which extend in parallel with one another between the zone of said flow inlet and the zone of said flow outlet, wherein said case comprises at least one non-perforated sheet, wherein said sheets are orientated in parallel with the axis of said case.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19735365 | 1997-08-14 | ||
| DE19735365.7 | 1997-08-14 | ||
| DE19742343A DE19742343C2 (en) | 1997-08-14 | 1997-09-25 | Ultrasonic damper |
| DE19742343.4 | 1997-09-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2245069A1 true CA2245069A1 (en) | 1999-02-14 |
Family
ID=26039150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2245069 Abandoned CA2245069A1 (en) | 1997-08-14 | 1998-08-12 | Ultrasonic attenuator |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0897083A3 (en) |
| CA (1) | CA2245069A1 (en) |
| NO (1) | NO983689L (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101158339A (en) * | 2007-11-06 | 2008-04-09 | 张裕光 | Converting unit of energy converter |
| CN102913712B (en) * | 2012-10-30 | 2015-02-04 | 长城汽车股份有限公司 | Vibration-reducing and noise-reducing device of high-pressure oil pipe of vehicle steering system |
| CN104832742A (en) * | 2015-05-25 | 2015-08-12 | 中国船舶重工集团公司第七○二研究所 | Assembly type micro-hole plate silencer |
| NL2015591B1 (en) * | 2015-10-09 | 2017-05-02 | Berkin Bv | Ultrasonic flow meter. |
| CN108980522A (en) * | 2018-09-20 | 2018-12-11 | 江苏格普新材料有限公司 | A kind of low calcium and magnesium glue lining and preparation method thereof coating inner barrel |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE450656B (en) * | 1982-05-14 | 1987-07-13 | Bahco Ventilation Ab | Muffler for ventilation ducts or ventilation equipment |
| DE4101709C1 (en) * | 1991-01-22 | 1992-07-30 | Veba Kraftwerke Ruhr Ag, 4650 Gelsenkirchen, De | Sound absorber for corrosive gas blower - is in form of massive, rigid glass body |
| NL1000492C1 (en) * | 1995-06-02 | 1996-12-03 | Q E International Bv | Silencer, a coke oven gas installation equipped with this, and a bulkhead for the silencer. |
-
1998
- 1998-08-06 EP EP98114812A patent/EP0897083A3/en not_active Withdrawn
- 1998-08-12 CA CA 2245069 patent/CA2245069A1/en not_active Abandoned
- 1998-08-12 NO NO983689A patent/NO983689L/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0897083A2 (en) | 1999-02-17 |
| NO983689L (en) | 1999-02-15 |
| EP0897083A3 (en) | 2000-03-29 |
| NO983689D0 (en) | 1998-08-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7303048B2 (en) | Method for filtering ultrasonic noise within a fluid flow system | |
| US9322689B2 (en) | Chordal gas flow meter with transducers installed outside the pressure boundary, and method | |
| US7073534B2 (en) | Silencer for perforated plate flow conditioner | |
| CA2071876C (en) | Ultrasonic flow meter | |
| MXPA02010816A (en) | Non-linear flow restrictor for a medical aspiration system. | |
| WO2007110712A2 (en) | Non-linear noise suppressor for perforated plate flow conditioner | |
| EP2101922A4 (en) | Full coverage fluidic oscillator with automated cleaning system and method | |
| NZ297179A (en) | Analyzing flow of a two phase flow in a conduit using flow indicator quantities calculated from return echo spectrum | |
| US20090218164A1 (en) | Double throat pulsation dampener for a compressor | |
| ATE320222T1 (en) | SURGICAL ENDOSCOPIC CUTTING DEVICE | |
| WO2005030306A3 (en) | Metering system and methods for aerosol delivery | |
| CA2245069A1 (en) | Ultrasonic attenuator | |
| GB2421574A (en) | Apparatus and method for monitoring the condition of pipelines | |
| YU66400A (en) | Method and apparatus for locating bending wave transducer means | |
| TW200636152A (en) | Compressor muffler | |
| CN104422109A (en) | Silencer for air conditioner and air conditioner with same | |
| DE50301652D1 (en) | Ultrasonic flowmeter | |
| SE9700853D0 (en) | Device for detecting inhomogeneities in a fluid flow | |
| CN208330392U (en) | A kind of pipe-plate lining of sound-deadening and noise-reducing | |
| GB2446547A (en) | Acoustic horn waveguides | |
| EP0127406A2 (en) | An improved pumping system | |
| AU5200399A (en) | Device for measuring the volume flow of a fluid in a pipe | |
| Thompson et al. | Noise generation by water pipe leaks | |
| DK1550351T3 (en) | Suspension means for transducers | |
| KR20090004320A (en) | Appratus for dissolving gas |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |