Gabatarwa da aikace-aikacen aunawa na vortex flowmeter

An yi amfani da ma'auni mai ma'auni mai mahimmanci wajen auna yawan tururi a cikin shekarun 1980, amma daga haɓaka kayan aiki na gudana, ko da yake na'urar hawan igiyar ruwa tana da dogon tarihi da aikace-aikace masu yawa; Mutane sun yi nazarinsa da kyau kuma bayanan gwaji sun cika, amma har yanzu akwai wasu nakasu wajen yin amfani da daidaitaccen ma'aunin igiyar ruwa don auna kwararar tururi: na farko, asarar matsin lamba tana da girma; Na biyu, bututun motsa jiki, ƙungiyoyi uku na bawuloli da masu haɗawa suna da sauƙin zubarwa; Na uku, kewayon ma'aunin ƙarami ne, gabaɗaya 3:1, wanda ke da sauƙi don haifar da ƙarancin ma'auni don manyan juzu'in kwarara. Na'urar motsi na vortex yana da tsari mai sauƙi, kuma ana shigar da mai watsawa kai tsaye a kan bututun, wanda ya shawo kan al'amuran bututun mai. Bugu da ƙari, ma'aunin motsi na vortex yana da ƙananan asarar matsa lamba da fadi da yawa, kuma ma'auni na ma'auni na cikakken tururi zai iya kaiwa 30: 1. Saboda haka, tare da balagaggen fasahar auna ma'aunin vortex, yin amfani da ma'aunin motsi ya fi shahara.

1. Ma'auni na ma'auni na vortex flowmeter

Vortex flowmeter yana amfani da ka'idar oscillation na ruwa don auna kwarara. Lokacin da ruwan ya ratsa ta hanyar watsawar vortex kwarara a cikin bututun, layuka biyu na vortices daidai gwargwado ana haifar da su sama da ƙasa a bayan janareta na vortex na ginshiƙin triangular. Mitar sakin vortex yana da alaƙa da matsakaicin saurin ruwan da ke gudana ta cikin janareta na vortex da kuma yanayin faɗin sifa na vortex janareta, wanda za a iya bayyana kamar haka:

Inda: F shine mitar sakin vortex, Hz; V shine matsakaicin saurin ruwan da ke gudana ta cikin janareta na vortex, m/s; D shine siffar sifa ta janareta na vortex, m; ST shine lambar Strouhal, maras girma, kuma ƙimar darajar sa shine 0.14-0.27. ST aiki ne na lambar Reynolds, st=f (1/re).

Lokacin da lambar Reynolds Re ke cikin kewayon 102-105, ƙimar st shine kusan 0.2. Saboda haka, a cikin ma'auni, adadin Reynolds na ruwan ya kamata ya zama 102-105 da mitar vortex f=0.2v/d.

Don haka, ana iya ƙididdige matsakaicin matsakaicin saurin V na ruwan da ke gudana ta hanyar janareta na vortex ta hanyar auna mitar vortex, sa'an nan kuma za a iya samun kwararar Q daga dabarar q=va, inda a shine yanki na giciye na ruwan da ke gudana. ta hanyar janareta na vortex.

Lokacin da aka haifar da vortex a ɓangarorin biyu na janareta, ana amfani da firikwensin piezoelectric don auna canjin canjin ɗagawa daidai gwargwado ga hanyar kwararar ruwa, canza canjin ɗaga zuwa siginar mitar lantarki, ƙarawa da siffata siginar mitar, da fitar da shi. zuwa kayan aiki na biyu don tarawa da nunawa.

2. Aikace-aikace na vortex flowmeter

2.1 zaɓi na vortex flowmeter

2.1.1 zaɓi na watsawar kwararar vortex

A cikin cikakken ma'aunin tururi, kamfaninmu yana ɗaukar nau'in VA nau'in mai watsa wutar lantarki ta hanyar Hefei Instrument General Factory. Saboda da fadi da kewayon vortex flowmeter, a cikin aikace-aikace na aikace-aikace, yawanci ana la'akari da cewa kwararar cikakken tururi ba kasa da ƙananan iyaka na vortex flowmeter, ma'ana, ruwa ya kwarara ruwa kada ta kasance kasa da 5m / s. Ana zaɓar masu watsa kwararar Vortex tare da diamita daban-daban bisa ga yawan tururi, maimakon diamita na bututun da ke gudana.

2.1.2 zaɓi na mai watsawa don matsa lamba

Saboda dogon cikar bututun tururi da babban matsi, dole ne a karɓi ramuwar matsin lamba. Yin la'akari da ma'amala mai dacewa tsakanin matsa lamba, zafin jiki da yawa, kawai ramuwa matsa lamba za a iya karɓa a cikin ma'auni. Tun da cikakken matsa lamba na bututun kamfaninmu yana cikin kewayon 0.3-0.7mpa, ana iya zaɓar kewayon mai watsawa azaman 1MPa.