EE01508U1 - The volumetric laminarizer of the uneven and non-stationary velocity fields - Google Patents
The volumetric laminarizer of the uneven and non-stationary velocity fieldsInfo
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- EE01508U1 EE01508U1 EEU201900038U EEU201900038U EE01508U1 EE 01508 U1 EE01508 U1 EE 01508U1 EE U201900038 U EEU201900038 U EE U201900038U EE U201900038 U EEU201900038 U EE U201900038U EE 01508 U1 EE01508 U1 EE 01508U1
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Abstract
Leiutis käsitleb ebaühtlaste ja mittestatsionaarsete kiirusväljade mahtühtlustit, millel on silindriline korpus, kus korpuse ühes otsas on vedeliku sissevoolu ava ja teises otsas väljavoolu ava, kusjuures nende avade läbimõõdud on väiksemad silindrilise korpuse siseläbimõõdust ning mahtühtlusti korpusesse on risti vedeliku liikumise suunaga paigutatud vedeliku kiirusväljade summutuselement, mis on moodustatud kahest oma põhjaosadega kokku ühendatud ümarast perforeeritud pindadega õõnsast koonusest, mille põhjade läbimõõt ühtib mahtühtlusti korpuse siseläbimõõduga.The invention relates to a volume equalizer for non-uniform and non-stationary velocity fields having a cylindrical housing having a fluid inlet opening at one end and an outlet opening at the other end, the diameters of these openings being smaller than the inner diameter of the cylindrical housing. is formed by two round hollow cones with perforated surfaces connected to their bottom parts, the diameter of the bottoms of which coincides with the inner diameter of the body of the volume equalizer.
Description
TEHNIKAVALDKOND TECHNOLOGY FIELD
Leiutis kuulub torustikes teostatava vedelike ja gaaside transpordi valdkonda ja on ette nähtud transporditavates keskkondades tekkivate ebaühtlaste ning mittestatsionaarsete kiirusväljade ühtlustamiseks. The invention belongs to the field of transportation of liquids and gases in pipelines and is intended for the equalization of uneven and non-stationary velocity fields arising in transported media.
Ülalkirjeldatud transpordil transporditavas vedelikus või gaasis tekkivad mittestatsionaarsed ning ebaühtlased kiirusväljad ei võimalda usaldusväärselt mõõta transporditava aine või keskkonna liikumiskiirust, mis omakorda raskendab oluliselt transpordiprotsessi juhtimist ning sellega vähendab selle efektiivsust. Nimetatud kiirusväljad ühtlustuvad küll vedeliku või gaasi pikemaajalise voolamise käigus sirges takistusteta torulõigus, kuid komplitseeritud ja liigendatud torustikusüsteemides, kus statsionaarset voolamist moonutavate takistuste (torustiku suuna muutused, torustiku hargnemised, torustiku sisearmatuurid, jms) ja sellega ebaühtlasi kiirusvälju tekitavate elementide vahemaad on ebapiisavad tekkinud kiirusväljade ühtlustumiseks, on transpordiprotsessi juhtimine eriti komplitseeritud. Mittestatsionaarne voolamine põhjustab ka jõude, mis võivad kahjustada nii torustikke kui ka neid teenindavaid seadmeid. The non-stationary and non-uniform velocity fields that arise in the transported liquid or gas during the above-described transport do not allow for reliable measurement of the velocity of the transported substance or medium, which in turn significantly complicates the control of the transport process and thus reduces its efficiency. These velocity fields do become uniform during the long-term flow of the liquid or gas in a straight, unobstructed pipe section, but in complicated and articulated piping systems, where the distances between obstacles that distort the stationary flow (changes in the direction of the pipeline, branching of the pipeline, internal fittings of the pipeline, etc.) and the elements that create non-uniform velocity fields are insufficient for the uniformization of the resulting velocity fields, the control of the transport process is particularly complicated. Non-stationary flow also causes forces that can damage both the pipelines and the equipment serving them.
TEHNIKA TASE STATE OF THE ART
Seadmed ebaühtlaste ja mittestatsionaarsete kiirusväljade ühtlustamiseks on käesoleval ajal juba tuntud. Need võivad olla realiseeritud iseseisva seadmena, kuid paljudel juhtudel ka vastava mõõteseadme sisendsõlmena, mis ühtlustab voolus olevad mittestatsionaarsed kiirusväljad enne voolava keskkonna jõudmist mõõteseadme andurini. Devices for smoothing non-uniform and non-stationary velocity fields are already known today. They can be implemented as a standalone device, but in many cases also as an input node of a corresponding measuring device, which smoothes the non-stationary velocity fields in the flow before the flowing medium reaches the sensor of the measuring device.
Nii on tuntud kulumõõtur, mille korpuse läbimõõt on oluliselt suurem kui selle sissevoolu avaja väljavoolu ava läbimõõdud, andur on paigutatud kulumõõturi väljavoolu ava lähedusse ning kulumõõturi korpusesse on paigutatud risti selle pikiteljega kaks teineteisest teatud kaugusel olevat kettakujulist perforeeritud vaheseina, mis funktsioneerivad kiirusväljade mahtühtlustina. Kulumõõturi sissevoolu avale lähemal oleva ketta perforatsioon on suuremate avadega, andurile lähemal oleva ketta perforatsiooni avad on aga poole väiksemad. Mõõturisse sisenev vedelikuvool, jaotudes üle Thus, a flow meter is known, the diameter of the housing of which is significantly larger than the diameters of the outlet openings of its inlet opening, the sensor is placed near the outlet opening of the flow meter, and two disk-shaped perforated partitions, which are at a certain distance from each other, are placed in the flow meter housing perpendicular to its longitudinal axis, which function as a volume equalizer of the velocity fields. The perforation of the disk closer to the inlet opening of the flow meter has larger openings, while the perforation openings of the disk closer to the sensor are half as small. The liquid flow entering the meter, being distributed over
esimese perforeeritud vaheseina, stabiliseerub teatud ulatuses, kaotades vaheseina läbides esmajoones pöörised. Seejärel läbib vedelik teise, peenema perforatsiooniga vaheseina, kus kiirusväljade radiaalsed komponendid sumbuvad ning koonilises ruumis pärast teist vaheseina kujuneb välja juba praktiliselt ühtlane kiirusväli (Vene Föderatsiooni kasulik mudel RU127904U1, publitseeritud 10.05.2013). the first perforated partition, stabilizes to a certain extent, primarily losing vortices as it passes through the partition. Then, the liquid passes through a second, more finely perforated partition, where the radial components of the velocity fields are attenuated and a practically uniform velocity field develops in the conical space after the second partition (Russian Federation Utility Model RU127904U1, published 10.05.2013).
Kirjeldatud kulumõõturis oleva kiirusvälja mahtühtlusti puuduseks on, et kiirusväljade efektiivse stabiliseerimise juures on sellise mahtühtlusti takistustegur küllaltki kõrge, ulatudes väärtuseni 4-5, mille tulemusena vedeliku transportimine torustikes on oluliselt energiakulukam. The disadvantage of the described velocity field volume equalizer in the flow meter is that, despite the effective stabilization of velocity fields, the resistance factor of such a volume equalizer is quite high, reaching a value of 4-5, as a result of which the transportation of liquid in pipelines is significantly more energy-intensive.
Samuti on tuntud enne mõõteseadet torustikku paigaldatav vedelikuvoo stabiliseerimise seade, mis kujutab endast vedeliku voolutorusse ühendatud silindrilist voolutorust suurema läbimõõduga seadet, mis on äärikühendustega kinnitatud voolutorule. Seadme sissevoolu ava läbimõõt on võrdne voolutoru läbimõõduga, väljundosa on aga kahaneva koonuse kujuline ja selle ümar ava on võrdne selle külge kinnitatava voolutoru läbimõõduga. Seadme sisse on risti vedeliku voolusuunaga paigutatud kooniline perforeeritud vahesein selliselt, et koonuse tipp on suunatud seadme sissevoolu ava poole, st vastu vedeliku voolu suunda. Seadmesse sisenev keeriste ja muude mittestatsionaarsete kiirusväljadega vedeliku või gaasi voog jaotub perforeeritud koonust läbides väiksemateks jugadeks, mille kiirus on suurem, kuid sellega ka rõhk madalam. Nende jugade segunemine toimub seadme väljavoolu ava poole kitsenevas koonuses ja selle lõpust ehk väljavoolu avast väljub juba stabiliseeritud vedeliku või gaasi vool. (Vene Föderatsiooni kasulik mudel RU162344U1, publitseeritud 10.06.2016). Also known is a liquid flow stabilization device installed in the pipeline before the measuring device, which is a cylindrical device with a larger diameter than the flow pipe connected to the liquid flow pipe, which is attached to the flow pipe with flange connections. The diameter of the inlet opening of the device is equal to the diameter of the flow pipe, while the outlet part is in the shape of a decreasing cone and its round opening is equal to the diameter of the flow pipe to be attached to it. A conical perforated partition is placed inside the device perpendicular to the direction of the liquid flow in such a way that the tip of the cone is directed towards the inlet opening of the device, i.e. against the direction of the liquid flow. The flow of liquid or gas with vortices and other non-stationary velocity fields entering the device is divided into smaller jets, the speed of which is higher, but the pressure is lower, as it passes through the perforated cone. The mixing of these jets takes place in a cone tapering towards the outlet opening of the device, and a stabilized flow of liquid or gas exits from its end, i.e. the outlet opening. (Utility model of the Russian Federation RU162344U1, published on 10.06.2016).
Kirjeldatud seadme eeliseks on, et selle takistustegur on oluliselt väiksem kui esimesena kirjeldatud tuntud lahendusel, kuid puuduseks on, et ebaühtlaste väljade ühtlustamise efektiivsus sõltub ühtlustatavate väljade ebaühtluse tasemest ja seadmesse siseneva vedelikuvoo suurte ebaühtluse tasemete korral väheneb vedelikuvoo maksimaalse kiiruse ja keskmise kiiruse suhe ainult 30-40%, seega kiirusväljade ühtlustamise efektiivsus ei ole piisav. The advantage of the described device is that its resistance factor is significantly lower than that of the first known solution described, but the disadvantage is that the efficiency of equalizing non-uniform fields depends on the level of non-uniformity of the fields to be equalized, and in the case of high levels of non-uniformity of the fluid flow entering the device, the ratio of the maximum velocity of the fluid flow to the average velocity decreases by only 30-40%, thus the efficiency of equalizing velocity fields is not sufficient.
LEIUTISE OLEMUS ESSENCE OF THE INVENTION
Käesoleva leiutise eesmärgiks on luua ebaühtlaste ja mittestatsionaarsete kiirusväljade mahtühtlusti konstruktsioon, milles on likvideeritud eelpool teisena kirjeldatud The aim of the present invention is to create a design for a volume equalizer for non-uniform and non-stationary velocity fields, in which the above-described second problem is eliminated.
leiutise puudused, st mis tagab, et ebaühtlaste kiirusväljade ühtlustamise efektiivsus sõltub võimalikult vähe seadmesse siseneva vedelikuvoo kiirusvälja ebaühtluse tasemest. the shortcomings of the invention, i.e. which ensures that the efficiency of equalizing non-uniform velocity fields depends as little as possible on the level of non-uniformity of the velocity field of the fluid flow entering the device.
Seatud eesmärk saavutatakse sellega, et ebaühtlaste ja mittestatsionaarsete kiirusväljade mahtühtlustis, millel on silindriline korpus, kus korpuse ühes otsas on vedeliku sissevoolu ava ja teises otsas väljavoolu ava, kusjuures nende avade läbimõõdud on väiksemad silindrilise korpuse siseläbimõõdust ning mahtühtlusti korpusesse on risti vedeliku liikumise suunaga paigutatud vedeliku kiirusväljade ühtlustuselement, mis on moodustatud kahest oma põhjaosadega kokku ühendatud ümarast perforeeritud pindadega õõnsast koonusest, mille põhjade läbimõõt ühtib mahtühtlusti korpuse siseläbimõõduga. The set objective is achieved by a volume equalizer for uneven and non-stationary velocity fields, which has a cylindrical housing, where there is a liquid inlet opening at one end of the housing and an outlet opening at the other end, whereby the diameters of these openings are smaller than the inner diameter of the cylindrical housing, and a fluid velocity field equalization element is placed in the housing of the volume equalizer perpendicular to the direction of fluid movement, which is formed of two round hollow cones with perforated surfaces connected together by their bottom parts, the diameter of the bottoms of which coincides with the inner diameter of the volume equalizer housing.
Mahtühtlusti korpus on moodustatud kahest osast, mis on omavahel kokku ühendatud korpuse pikitelje suhtes laupühendusega. The volume equalizer housing is formed from two parts, which are connected together with a butt joint relative to the longitudinal axis of the housing.
Mahtühtlusti sissevoolu ava ja väljavoolu ava läbimõõdud on võrdsed ja korpuse siseläbimõõt on vähemalt 1,5-2 korda suurem nende avade iäbimõõdust. The diameters of the inlet and outlet openings of the volume equalizer are equal, and the inner diameter of the housing is at least 1.5-2 times larger than the diameter of these openings.
Mahtühtlusti korpuse sisepind sissevoolu avast kuni korpuse siseläbimõõdu saavutamiseni on sujuvalt laienev. The inner surface of the volume equalizer housing from the inlet opening until the inner diameter of the housing is reached is smoothly expanding.
Mahtühtlusti korpuse sisepind siseläbimõõdust kuni väljavoolu ava läbimõõdu saavutamiseni on sujuvalt kitsenev. The inner surface of the volume equalizer housing is smoothly tapered from the inner diameter until it reaches the diameter of the outlet opening.
Perforatsiooniavad mõlemal koonuspinnal on identse kuju ja mõõtmetega. The perforation holes on both conical surfaces are of identical shape and dimensions.
Perforatsiooniavade pikitelg on paralleelne mahtühtlusti korpuse pikiteljega. The longitudinal axis of the perforation holes is parallel to the longitudinal axis of the volume equalizer housing.
ILLUSTRATSIOONIDE LÜHIKIRJELDUS BRIEF DESCRIPTION OF ILLUSTRATIONS
Joonisel fig 1 on esitatud mahtühtlusti põhimõtteline konstruktsioon. Figure 1 shows the basic design of a volume equalizer.
Joonisel fig 2 on esitatud leiutisekohase mahtühtlusti töö modelleerimise tulemused torustiku pikilõikes. Figure 2 presents the results of modeling the operation of the volume equalizer according to the invention in a longitudinal section of the pipeline.
Joonisel fig 3 on esitatud kiirusväljad joonisel fig 2 tähistatud ristlõigetes. Figure 3 presents the velocity fields in the cross sections marked in Figure 2.
LEIUTISE TEOSTAMISE NÄIDE EXAMPLE OF IMPLEMENTATION OF THE INVENTION
Mahtühtlusti korpus koosneb kahest silindriliselt osast - sisendosast 1 ja väljundosast 2, mis on omavahel kokku ühendatud korpuse pikitelje suhtes laupühendusega 3. Sisendosas 1 on vedeliku sissevoolu ava 4, väijundosas 2 aga vedeliku väljavoolu ava 5, kusjuures avade 4 ja 5 läbimõõdud on võrdsed. Mahtühtlusti korpusesse on risti vedeliku liikumise suunaga paigutatud vedeliku kiirusväljade ühtlustuselement 6, mis on moodustatud kahest oma põhjaosadega kokkuühendatud ümarast perforeeritud pindadega õõnsast koonusest 7 ja 8, millede põhja läbimõõt ühtib mahtühtlusti korpuse siseläbimõõduga ja mõlemad koonused 7 ja 8 on oma perimeetril jäigalt ühendatud korpuse sisepinna külge. The volume equalizer housing consists of two cylindrical parts - the input part 1 and the output part 2, which are connected to each other with a butt joint 3 relative to the longitudinal axis of the housing. The input part 1 has a liquid inlet opening 4, and the output part 2 has a liquid outlet opening 5, with the diameters of the openings 4 and 5 being equal. A fluid velocity field equalization element 6 is placed in the volume equalizer housing perpendicular to the direction of fluid movement, and is formed of two round hollow cones 7 and 8 with perforated surfaces connected to their bottom parts, the diameter of the bottom of which coincides with the inner diameter of the volume equalizer housing, and both cones 7 and 8 are rigidly connected to the inner surface of the housing at their perimeter.
Mahtühtlusti korpuse sisendosa 1 sisepind sissevoolu avast 4 kuni korpuse siseläbimõõdu saavutamiseni on sujuvalt laienev, korpuse väijundosas 2 sisepind aga alates korpuse siseläbimõõdust kuni väljavoolu avani 5 läbimõõduni on sujuvalt kitsenev. Korpuse siseläbimõõt on vähemalt 1,5-2 korda suurem sissevoolu ava 4 ja väljavoolu ava 5 läbimõõdust. The inner surface of the inlet part 1 of the volume equalizer housing from the inlet opening 4 to the inner diameter of the housing is smoothly expanding, while the inner surface of the outlet part 2 of the housing from the inner diameter of the housing to the diameter of the outlet opening 5 is smoothly narrowing. The inner diameter of the housing is at least 1.5-2 times larger than the diameter of the inlet opening 4 and the outlet opening 5.
Koonuste 7 ja 8 perforatsiooniavad 9 on ümarad ja mõlemas koonuses sama läbimõõduga, kusjuures nende läbimõõt on 10-20 mm ja need paiknevad sammuga S = 20 kuni 40 mm ning nende pikiteljed on paralleelsed mahtühtlusti korpuse pikiteljega. Avade läbimõõt valitakse lähtuvalt mahtühtlusti korpuse siseläbimõõdust. Perforatsiooni eespool kirjeldatud parameetrid on mahtühtlustitele, mis paigutatakse torustikesse diameetriga kuni 30 cm, kui torustike läbimõõt ületab selle väärtuse, on otstarbekas suurendada ka mahtühtlusti ühtlustuselemendi 6 perforatsiooniavade läbimõõtu, kuid see ei tohi ületada 20 mm. The perforation holes 9 of the cones 7 and 8 are round and have the same diameter in both cones, with their diameter being 10-20 mm and they are arranged with a pitch of S = 20 to 40 mm and their longitudinal axes are parallel to the longitudinal axis of the volume equalizer housing. The diameter of the holes is selected based on the inner diameter of the volume equalizer housing. The perforation parameters described above are for volume equalizers that are placed in pipelines with a diameter of up to 30 cm; if the diameter of the pipelines exceeds this value, it is expedient to also increase the diameter of the perforation holes of the volume equalizer equalization element 6, but it must not exceed 20 mm.
Mahtühtlusti ühendatakse sissevoolu ava 4 ja väljavoolu ava 5 abil torustikku, kus on vajalik ebaühtlaste ja mittestatsionaarsete kiirusväljade ühtlustamine. Vedelikuvoo sisenemisel sissevoolu ava 4 kaudu toimub mahtühtlusti sisendosas 1 selle voo äkiline laienemine, mis on tingitud sisendosa 1 oluliselt suuremast läbimõõdust võrreldes sissevoolu ava 4 läbimõõduga ja selle laienemisega osaliselt ühtlustuvad ka mittestatsionaarsed kiirusväljad, esmajoones turbulentsed. Kiirusväljade edasine ühtlustumine toimub siis, kui vedelik läbib kaks koonust 7 ja 8, mis moodustavad ühtlustuselemendi 6. Ühtlustuselemendis 6 oleva esimese koonuse 7 perforatsiooniavade 9 läbimisel vähendavad korpuse üla- ja allosas tekkivad paralleelsed vedelikuvood olulises osas vedeliku turbulentsi ja selle edasine ühtlustumine toimub, kui vedelik läbib teises koonuses 8 olevad avad 9. Teise koonuse 8 läbinud ja oluliselt turbulentsi kaotanud vedelik stabiliseerub veelgi mahtühtlusti sujuvalt kitseneva väljundosa 2 läbimisel ja väljavoolu avasse 5 jõudnud vedelik on saavutanud juba sisuliselt laminaarse voolamise režiimi. The volume equalizer is connected to the pipeline via the inlet opening 4 and the outlet opening 5, where the equalization of uneven and non-stationary velocity fields is required. When the liquid flow enters through the inlet opening 4, a sudden expansion of the flow occurs in the inlet part 1 of the volume equalizer, which is due to the significantly larger diameter of the inlet part 1 compared to the diameter of the inlet opening 4, and with this expansion, non-stationary velocity fields, primarily turbulent ones, also partially equalize. Further homogenization of the velocity fields occurs when the liquid passes through two cones 7 and 8, which form the homogenization element 6. When passing through the perforation openings 9 of the first cone 7 in the homogenization element 6, the parallel liquid flows that arise at the top and bottom of the housing significantly reduce the turbulence of the liquid, and its further homogenization occurs when the liquid passes through the openings 9 in the second cone 8. The liquid that has passed through the second cone 8 and has significantly lost turbulence is further stabilized when passing through the smoothly narrowing outlet part 2 of the volumetric homogenizer, and the liquid that has reached the outlet opening 5 has already achieved an essentially laminar flow regime.
Leiutise efektiivust kontrolliti modelleerides matemaatiliselt õhu liikumist joonisel fig 2 kujutatud torustikus, kus toru osalisel sugemisel siibriga loodi torustikus enne mahtühtlustit eriti kõrge erisuunaliste kiirusväljade kontsentratsioon. Kiirusväljade olukord fikseeriti neljas ristlõikes toru pikkusel: l-l - toru ühe läbimõõdu kaugusel enne siibrit; ll-ll - toru poole läbimõõdu kaugusel pärast siibrit; lll-lll - mahtühtlusti korpuse silindrilise osa lõpus ja IV-IV - toru ühe läbimõõdu kaugusel mahtühtlusti otsast. Modelleerimine näitas, et siibriga tekitatud väga intensiivsed erisuunalised kiirusväljad (ristlõige 11-11), mis suunati siis ühtlustuselemendile ning juba enne ühtlustuselemendist väljumist olid need oluliselt ühtlustunud (ristlõige lll-lll) ja toru ühe The effectiveness of the invention was verified by mathematically modeling the air movement in the pipeline shown in Figure 2, where a partial narrowing of the pipe with a damper created an especially high concentration of velocity fields in different directions in the pipeline before the volume equalizer. The situation of the velocity fields was recorded in four cross-sections along the length of the pipe: l-l - at a distance of one pipe diameter before the damper; ll-ll - at a distance of half a pipe diameter after the damper; lll-lll - at the end of the cylindrical part of the volume equalizer body and IV-IV - at a distance of one pipe diameter from the end of the volume equalizer. The modeling showed that the very intense velocity fields in different directions created by the damper (cross-section 11-11), which were then directed to the equalization element and even before leaving the equalization element, had significantly become equalized (cross-section lll-lll) and one pipe
läbimõõdu kaugusel mahtühtlusti otsast (ristlõige IV-IV) olid torus eelnevalt olnud erinevad kiirusväljad täielikult ühtlustunud. diameter from the end of the volume equalizer (cross section IV-IV), the different velocity fields previously present in the tube had completely become uniform.
Claims (7)
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| EEU201900038U EE01508U1 (en) | 2019-07-03 | 2019-07-03 | The volumetric laminarizer of the uneven and non-stationary velocity fields |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5529093A (en) * | 1994-01-31 | 1996-06-25 | Integrity Measurement Partners | Flow conditioner profile plate for more accurate measurement of fluid flow |
| GB2394254A (en) * | 2002-09-20 | 2004-04-21 | Visteon Global Tech Inc | I.c. engine air induction system with air flow straightening/ rectifying device upstream of a mass air flow sensor |
| WO2008143834A1 (en) * | 2007-05-18 | 2008-11-27 | Mccrometer, Inc. | Flow straightening apparatus |
| EP3081909A1 (en) * | 2015-04-13 | 2016-10-19 | Carl Freudenberg KG | Assembly with a flow aligner |
| US20180329435A1 (en) * | 2017-04-25 | 2018-11-15 | Flow Dynamics, Llc | Externally Adjustable Flow Management Valve Assembly and System |
-
2019
- 2019-07-03 EE EEU201900038U patent/EE01508U1/en active Protection Beyond IP Right Term
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5529093A (en) * | 1994-01-31 | 1996-06-25 | Integrity Measurement Partners | Flow conditioner profile plate for more accurate measurement of fluid flow |
| GB2394254A (en) * | 2002-09-20 | 2004-04-21 | Visteon Global Tech Inc | I.c. engine air induction system with air flow straightening/ rectifying device upstream of a mass air flow sensor |
| WO2008143834A1 (en) * | 2007-05-18 | 2008-11-27 | Mccrometer, Inc. | Flow straightening apparatus |
| EP3081909A1 (en) * | 2015-04-13 | 2016-10-19 | Carl Freudenberg KG | Assembly with a flow aligner |
| US20180329435A1 (en) * | 2017-04-25 | 2018-11-15 | Flow Dynamics, Llc | Externally Adjustable Flow Management Valve Assembly and System |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXFP | Utility model extended to 8 or 10 years after payment of fee |
Expiry date: 20270703 |