Matsakaicin sarrafawa mai ɗaukar ciki (CV, KV) na tsarin sassa daban-daban suna da matsala a cikin wani yanki mai tsayayyen lokaci lokacin da bawul ɗin ke gudana a cikin wani ɓangare daban-daban. dangantaka tsakanin CV = 1.156Kv, Cv = 1.167C.Wannan labarin yana ba da ma'anar, raka'a, jujjuyawa da ingantaccen tsarin samarwa na Cv, Kv da C.
1. Ma'anar kwarara coefficient
Matsakaicin magudanar ruwa shine takamaiman ruwa a takamaiman zafin jiki, lokacin da bawul ɗin ya ƙare don matsa lamba daban-daban na naúrar, adadin adadin ruwan da ke gudana ta hanyar bawul ɗin sarrafawa a cikin naúrar lokaci, ta amfani da tsarin daban-daban na raka'a lokacin da akwai hanyoyi daban-daban. na magana.
Ma'anar ma'aunin ruwa C
Ba da bugun jini, zafin jiki na 5-40 ℃ ruwa, bawul matsa lamba bambanci tsakanin biyu iyakar 1kgf / cm2, da girma na kwarara ta cikin bawul a awa daya (bayyana a m3) .C ne ya kwarara coefficient na kowa metric, kasar mu a baya an yi amfani da shi na dogon lokaci, wanda aka fi sani da karfin karfin wutar lantarki na C. Ƙwararren ruwa na C shine ma'auni na ma'auni na gama gari.
② Ma'anar ƙayyadaddun ƙira Kv
Idan aka ba da bugun jini, bambancin matsa lamba tsakanin iyakar biyu na bawul shine 102kPa, yawan zafin jiki na 5-40 ℃ ruwa, ƙarar ruwa yana gudana ta hanyar bawul ɗin sarrafawa a awa daya (an bayyana a cikin m3).kv shine tsarin kasa da kasa na raka'a kwarara coefficient.
③ Ma'anar ƙayyadaddun ƙayyadaddun bayanai na Cv
Adadin ruwa a zafin jiki na 60 ° F wanda ke gudana ta hanyar bawul mai daidaitawa a cikin minti daya (wanda aka bayyana a cikin gallon US gal) don bugun jini da aka ba shi tare da matsa lamba na 1lb/in2 a kowane ƙarshen bawul.Cv shine sarki. magudanar ruwa.
2. Samuwar da dabara don daban-daban naúrar tsarin
① Ƙarfin kewayawa C dabara da raka'a
当γ/γ0=1，Q=1m3/h，△P=1kgf/cm2时，如C定义为1，则N=1。则流通能力C的公式及单位如下
Lokacin da γ/γ0=1, Q=1m3/h, △P=1kgf/cm2, idan an ayyana C a matsayin 1, sannan N=1.Tsarin tsari da naúrar ƙarfin kewayawa C sune kamar haka:
A cikin ma'auni C shine ƙarfin kewayawa;Naúrar Q shine m3/h;γ/γ0 shine takamaiman nauyi;Naúrar P shine kgf/cm2.
② Flow coefficient Cv lissafin dabara da naúrar
Lokacin da ρ/ρ0 = 1, Q = 1USgal / min, ∆P = 1lb / in2, kuma idan an bayyana Cv = 1, to N = 1.Tsarin tsari da raka'a na ma'aunin ma'aunin ruwa na Cv sune kamar haka:
inda CV shine madaidaicin kwarara;Q yana cikin USgal/min;ρ/ρ0 shine ƙayyadaddun yawa;kuma ∆P yana cikin lb/in2.
③ Flow coefficient Kv lissafin dabara da naúrar
Lokacin ρ/ρ0=1, Q=1m3/h, ΔP=100kPa, idan Kv=1, to N=0.1.Tsarin tsari da naúrar ƙayyadaddun ƙimar Kv sune kamar haka:
inda Kv shine madaidaicin kwarara;Q yana cikin m3/h;ρ/ρ0 shine ƙayyadaddun yawa;ΔP yana cikin kPa.
3, Conversion na wurare dabam dabam iya aiki, ya kwarara coefficient Kv, ya kwarara coefficient Cv
① kwarara coefficient Cv da wurare dabam dabam ikon dangantaka
inda aka san cewa Q yana cikin USgal / min;ρ/ρ0 shine ƙayyadaddun yawa;kuma ∆P yana cikin lb/in2.
Lokacin da C=1, Q=1m3/h, γ/γ0=1 (watau ρ/ρ0=1), da ∆P=1kgf/cm2, maye gurbin tsarin Cv tare da yanayin C=1 shine:
Daga lissafin, mun san cewa C=1 da Cv=1.167 daidai suke (watau Cv=1.167C).
② Canjin Cv da Kv
Lokacin da Kv = 1, Q = 1m3 / h, ρ / ρ0 = 1, △ P = 100kPa mai maye gurbin tsarin Cv don jujjuya raka'a:
Wato Kv = 1 daidai yake da Cv = 1.156 (watau Cv = 1.156Kv).
Saboda wasu bayanai da samfurori na ikon sarrafa bawul ɗin C, Kv mai haɓakawa da tsarin gudana Cv uku rashin tsari na haɓakawa, amfani da sauƙi don samar da rudani.Changhui Instrumentation C, Kv, Cv daga ma'anar, aikace-aikacen naúrar da alaƙar da ke tsakanin ukun da za a fayyace, don taimakawa masu zanen injiniya a cikin aiwatar da tsarin zaɓin bawul da lissafin maganganu daban-daban na ƙayyadaddun ƙayyadaddun kwarara (C, Kv, Cv) don juyawa da kwatanta, don sauƙaƙe zaɓi na bawuloli masu daidaitawa fiye da zaɓin.
Kimar CV na bawul ɗin malam buɗe ido na Tianjin Zhongfa Valve sune kamar haka, idan ya cancanta, da fatan za a koma.