I roto i te mahi aroturuki pehanga rerekētanga, ka kitea e tātou i ētahi wā me tukatuka te putanga o te tuku pehanga rerekētanga ki te tohu pūtake tapawhā 4~20mA. He maha ngā whakamahinga pēnei e puta ana i roto i te pūnaha ine rere ahumahi e whakamahi ana i te mātāpono pehanga rerekētanga, koinei tētahi o ngā huarahi rongonui mō te aroturuki tere rere. I muri i te arotake poto i te ine rere DP, ka taea e tātou te mārama ki te tūranga o te tuku pehanga rerekētanga ki te āwhina i te mahi a te mita rere.
He mea nui te mahi a ngā mita rere ki te aroturuki i te tere o te wai i roto i te whatunga paipa ahumahi uaua mā te whakarato i te pānui rere i runga i te wā tika me te tika e whai wāhi ana ki te whakahaere rauemi whai hua me te haumaru mahi. Ko te huarahi pēhanga rerekē tētahi o ngā hangarau ine rere nui e uru ana ki ngā momo mita rere. He rerekē te hanganga engari he rite tonu ngā whāinga whakahaere hei waihanga i te āputa pēhanga mō te tatau rere e ahu mai ana i te mātāpono matua oTe Whārite a BernoulliKo te pūngao katoa e mau tonu ana, arā, ko te pūngao nekeneke me te pūngao pūmanawa i roto i te rere o te wai, ahakoa ngā āhuatanga. Nō reira, ko te wāhanga matua o aua mita rere DP he taputapu whakawhāiti (pereti kōhao, ngongo venturi, ngongo pitot, v-cone, me ētahi atu) hei hanga i te whakaterenga rere i te wāhanga ā-rohe, ka heke te pēhanga wai-pūmau o te wai.
Koinei te wāhi e whai wāhi ai te tuku pehanga rerekētanga. Ko ngā huānga matua he taputapu miihini noa iho, ka whakaputa ā-tinana i te rerekētanga pehanga i roto i te tukanga engari kāore tetahi o ēnei e kaha ki te ine tika i te uara me te tohu putanga. Nō reira, me whai kaiawhina rātou ki te kite i te pehanga rerekētanga i waenga i te awa whakarunga me te awa whakararo, ā, hei huri hei tohu putanga o te uara ine rere —— he mahi tino pai tēnei mō te tuku pehanga rerekētanga.
I muri i te whakatūnga o te inenga DP, ko te pātai me pēhea te hononga o te pēhanga rerekētanga me te tere rere rōrahi? I runga i te Whārite a Bernoulli me te Whārite Tonutanga, he whanaungatanga kore-raina kei waenganui i te pēhanga rerekētanga i hangaia (ΔP) me te tere rere wai tuturu (Q):
Q=K√ΔP
Ko K te tohu mō tētahi tauwehenga motuhake ki te mita e whakatauhia ana e ngā āhuatanga o te momo huānga tuatahi me ētahi atu āhuatanga (te mātotoru wai, te rahi o te paipa me ētahi atu). Kāore te tohu mata 4~20mA o te tuku i te rārangi ki te tere rere, ā, kāore e taea te whakaatu tika i tōna ia. Ka taea te whakatau i te take mā te whakauru i te tango pakiaka tapawhā (SRE) e pakiaka tapawhā ana i te ΔP taketake, ka hanga te tohu kia ōrite ki te tere rere rōrahi i te mutunga.
Mena kāore e taea e te tuku hiko te whakahaere i te SRE i roto, me whakahaere te tataunga e te rorohiko rere o waho, e te pūnaha whakahaere rānei, ka nui ake te uaua me ngā hapa pea i roto i te ara tohu. Nō reira, ko ngā tuku hiko DP hou he mahi SRE tohu kua hangaia ki roto i te ara iahiko anarau, ā, ka taea te whakaputa i te 4~20mA tapawhā. Heoi anō, ka taea e ngā tuku hiko DP te whakamahi i te tapahi rere iti hei whakaiti i te nekenekehanga o te pūoko ka taea te whakanui ake i te tere rere iti. Ka akiakihia e tēnei mahi pūmanawa te putanga ki te 4 mA (0% rere) ina heke te rere kua tatauhia ki raro i te paepae kua tautuhia hei karo i te tohu pōturi me te kohikohinga rere teka.
Ko ngā pūnaha ine rere pēhanga rerekē tētahi o ngā hangarau whakahaere rere kua tino whakamātauhia, kua tino rongonui hoki. Ahakoa he tino painga, he iti anō hoki ngā herenga nā te hanganga me te kaupapa:
+ Hoahoa paerewa, hangarau kua whakapumautia
+ He hanganga pakari, he pakari hoki, kāore he wāhanga e neke ana
+ Te tika me te pumau kua whakapaitia
- Te ngaronga pēhanga tuturu
- Te ōwehenga whakawhāiti o te hurihanga
- He tairongo ki ngā panonitanga o te mātotorutanga wai me ētahi atu āhuatanga
He mea nui te whiriwhiri i te mita rere tika mō te whai huatanga me te tika o te ine i te rere o te wai. Mā te whakaaro whānui ki ngā āhuatanga whakahaere ka taea e ngā kaiwhakamahi te whakatau whai whakaaro e hangai ana ki ngā hiahia motuhake.Shanghai WangyuanNeke atu i te 20 tau a mātou e mahi ana i te hanga me te ratonga i ngā taputapu ine me te whakahaere, tae atu ki ngā momo mita rere katoa, ngā tuku pehanga rerekētanga me ētahi atu taputapu mō te ine rere. Mēnā he pātai, he hiahia rānei āu, tēnā whakapā mai.
Wā tuku: 25 o Ākuhata-2025