Uma kuziwa ekugcineni ukusebenza okuphezulu ezinhlelweni zomusi wezimboni, zimbalwa izingxenye ezibaluleke kakhulu kune-steam trap. Leli thuluzi elingabonakali liqinisekisa ukuthi i-condensate, umoya, namanye amagesi angenakuncishiswa akhishwa ngempumelelo ngenkathi kuvinjelwa umusi ophilayo ukuthi ungaphumi ohlelweni. I-steam trap engasebenzi kahle ingaholela ekumoshweni kwamandla, ukuncipha kokudluliswa kokushisa, kanye nokulimala kwemishini okuyinhlekelele. Yingakho izimboni emhlabeni wonke zibhekisela ku-Qiaofa Machinery ngezisombululo ze-steam trap ezinokwethenjelwa, ezisebenza kahle ezinikeza impilo yesevisi ende ngaphansi kwezimo ezinzima. Ngamashumi eminyaka obuchwepheshe bokukhiqiza kanye nokuzibophezela ekwakhiweni okunembile, i-Qiaofa isizimise njengomlingani othembekile wokuthuthukiswa kohlelo lomusi. Kulesi sihloko, sihlola konke okudingeka ukwazi mayelana nama-steam trap, izinhlobo i-Qiaofa ezinikezayo, nokuthi kungani le nkampani igqama emakethe enokuncintisana.

I-Steam iseyisinye sezinto ezisetshenziswa kakhulu emkhakheni wokukhiqiza, ukuphehla ugesi, kanye nezimboni zokucubungula. Ukuphathwa kabi kwe-steam kuholela ngqo ezindlekweni eziphezulu zokusebenza kanye nokwehla komkhiqizo. I-steam trap yekhwalithi ephezulu iyisihluthulelo esivimbela lezo zindleko. I-Qiaofa Machinery, umkhiqizi oqinisekiswe yi-ISO onomlando odlula iminyaka engamashumi amane, iqonda leli qiniso kangcono kunanoma ubani. Uhlu lwemikhiqizo yale nkampani luhlanganisa izinhlobo ze-steam trap kusukela kwezomshini kanye ne-thermodynamic kuya kuma-Venturi designs, zonke zakhiwe ukumelana nezimo ezinzima kanye nezindinganiso eziqinile zokusebenza. Noma ngabe uthuthukisa isistimu ekhona noma usungula imboni entsha kusukela ekuqaleni, ukukhetha i-trap efanele yisinqumo esithinta inzuzo yakho iminyaka eminingi ezayo. Ezigabeni ezilandelayo, sicubungula ngokujulile ubuchwepheshe, uhlu lwemikhiqizo, kanye nenani elilethwa yi-Qiaofa.

Ezingeni eliyisisekelo, i-steam trap iyivalvu ezishintshayo ehlukanisa phakathi kwesitimu ne-condensate, ivuleke ukuze ikhiphe i-condensate futhi ivale ukuze ibambe isitimu ngaphakathi kohlelo. Lolu cingo luncike kwesinye sezindlela ezimbalwa zokusebenza—umehluko wokuminyana, ukushintsha kwezinga lokushisa, noma amandla okucindezela/ijubane—ukuze lenze umsebenzi walo ngokuthembekile. Ngaphandle kwe-steam trap esebenza kahle, i-condensate iqoqana emapayipini nasema-heat exchanger, okubangela i-water hammer, ukugqwala, kanye nokwehla okukhulu kokusebenza kahle kokushisa. Empeleni, ucwaningo lwezimboni lulinganisela ukuthi i-steam trap eyodwa ehlulekile ingamosha izinkulungwane zamaRandi ezindlekweni zikaphethiloli unyaka ngamunye. Yingakho ukuhlolwa nokunakekelwa kwe-trap okuvamile kubalulekile kunoma yisiphi isikhungo esisebenzisa isitimu ukushisa, ukucubungula, noma ukukhiqiza ugesi.

Ngaphandle komsebenzi oyisisekelo, ama-steam trap esimanje kufanele abhekane nezinhlobonhlobo zezingcindezi, amazinga okushisa, nezimo zokugeleza. I-trap esebenza kahle ohlelweni lokushisa olunezingcindezi ephansi ingase ihluleke ngokushesha embonini yamakhemikhali enengcindezi ephezulu. Imiphumela yokuhluleka idlula ukulahlekelwa kwamandla: i-condensate ebuyela emuva kuma-turbine noma ama-compressor ingabangela ukulimala kwemishini, ukuma kokukhiqiza, nezingozi zokuphepha. Yingakho onjiniyela kufanele bahlole ngokucophelela amapharamitha okusebenza ngaphambi kokukhetha i-valve ye-steam trap ohlelweni oluthile. I-Qiaofa Machinery ihlinzeka ngemininingwane ephelele yezobuchwepheshe yemodeli ngayinye, isiza amakhasimende ukuthi enze izinqumo ezinolwazi. Ngokuqonda indima eyisisekelo ye-steam trap kanye nezingozi zokunganaki, abathengi bezimboni bangabona ukuthi kungani ukutshala imali emkhiqizweni wekhwalithi ephezulu kuzikhokhela kaningi.

Abakwa-Qiaofa Machinery bakhiqiza izinhlobo eziningi zama-steam trap ukuze bahlangabezane nezidingo ezahlukene zezimboni zomhlaba wonke. Idizayini ngayinye isebenzisa umgomo wokusebenza ohlukile, inikeza izinzuzo eziyingqayizivele kuye ngokusetshenziswa. Ngezansi sihlola izigaba ezintathu eziyinhloko embonini yemikhiqizo yakwa-Qiaofa.

Ama-steam trap emishini asebenza ngokusekelwe emehlukanisweni wokuminyana phakathi komusi kanye ne-condensate. Uhlu lwemishini luka-Qiaofa luhlanganisa kokubili ama-float trap kanye namadizayini e-inverted bucket, womabili enziwe nge-stainless steel yekhwalithi ephezulu kanye nama-alloy amelana nokugqwala. I-float trap, evame ukubizwa ngokuthi imodeli FT14, isebenzisa ibhola elingenalutho elikhuphukayo lehle ngokulingana nezinga le-condensate, lilawule i-valve yokukhipha ngokulingana. Lolu dizayini luhlinzeka ngokususwa kwe-condensate okuqhubekayo nokulawulwayo ezingeni lokushisa komusi, okwenza kube yinto efanelekile kuma-heat exchanger kanye nemishini yezinqubo lapho ukudluliswa kokushisa okungaguquki kubalulekile. I-inverted bucket trap, ngakolunye uhlangothi, incike endleleni elula kodwa eqinile emelana kakhulu nokungcola kanye ne-scale. Zombili lezi zinhlobo zenziwe ngokunemba okuphezulu ukuze zihambisane nemingcele eqinile, ziqinisekisa ukusebenza okuthembekile ezikhathini eziyizigidi zomjikelezo. Ezikhungweni ezifuna i-mechanical steam trap ehlala isikhathi eside, izinto ezihlinzekwa yi-Qiaofa zenzelwe ukuletha impilo yesevisi ekhethekile ngisho nasezindaweni eziyinselele kakhulu.

Ama-thermodynamic steam trap asebenzisa amandla ashukumisayo e-flash steam ukuvula nokuvala i-disc valve. Uhlu lwe-thermodynamic lwe-Qiaofa lwenzelwe izinhlelo ze-high-pressure ne-superheated steam lapho ezinye izinhlobo zama-trap zingase zibe nzima khona. Lawa ma-trap aqinile ngokwemvelo, anengxenye eyodwa kuphela eshukumisayo—i-disc—okuwenza angabi sengozini yokuguga nokubambeka. Akwazi ukumelana ne-water hammer kahle, amelana nokufa yiqhwa uma efakwe ngokuqondile, futhi angasebenza ngaphakathi kwebanga lokucindezela elibanzi ngaphandle kokulungiswa. Ezikhungweni zokuphehla ugesi nezamakhemikhali ezibhekana nokushintshashintsha kwemithwalo nezimo ze-steam eziphakeme, ama-thermodynamic trap e-Qiaofa anikeza isisombululo esithembekile, esingadingi ukunakekelwa cishe. Inqubo yokukhiqiza yale nkampani iqinisekisa ukuthi i-disc ngayinye nesihlalo sayo kugqitywa ngamazinga aphezulu, okunikeza ukuvaleka okuqinile okunciphisa ukulahleka kwe-steam. Uma udinga i-steam trap engamelana nobunzima bezinhlelo zamandla aphezulu, umndeni wama-thermodynamic ovela kwa-Qiaofa uyisinqumo esifakazelwe.

Ama-Venturi steam traps amele indlela ehluke ngokuphelele ekususeni i-condensate. Esikhundleni sokuncika ezingxenyeni ezinyakazayo, la ma-trap asebenzisa i-nozzle enomumo okhethekile (i-Venturi orifice) ukudala ukwehla kwengcindezi okuhambisa i-condensate ngokuqhubekayo kuyilapho igcina i-steam. Ama-Venturi traps akwa-Qiaofa azilawula ngokwawo, okusho ukuthi azivumelanisa nokwehla okuhlukahlukene ngaphandle kwezilawuli zangaphandle noma ukulungiswa. Lo mklamo ususa ukuguga kwemishini futhi unikeza isikhathi sokusebenza eside kakhulu ngaphandle kwesondlo. Isici sokugeleza okuqhubekayo siphinde sivimbele ukushintshashintsha kwezinga lokushisa okungadala ukukhathala kwama-heat exchangers namapayipi. Ezinhlelweni lapho ukwethembeka nokusebenza kahle kwamandla kubaluleke kakhulu—njengakuma-steam mains, imigqa yokulandelela, nezifudumezi zenqubo—ama-Venturi traps akwa-Qiaofa anikeza isisombululo esikhangayo. Ngokufaka imodeli ye-CFD ethuthukisiwe ngesikhathi sokuklama, inkampani iqinisekisa ukuthi i-Venturi trap ngayinye inikeza ukusebenza okuphezulu kuzo zonke izimo zokusebenza ezahlukahlukene. Lokhu kuwubufakazi bangempela bekhono lobunjiniyela lakwa-Qiaofa.

I-Qiaofa Machinery ihlukanisa ngokuzibophezela okungantengantengi ekhwalithini, ekuqambeni izinto ezintsha, nasekusekeleni amakhasimende. Wonke ama-steam trap akhiqizwa yile nkampani aqala ngezinto zokusetshenziswa ezikhethwe ngokucophelela—insimbi engagqwali, ama-alloy aqinisiwe, kanye nezivalo zokushisa okuphezulu—ezimelana nokugqwala, ukuguguleka, kanye nokonakala kokushisa. Inqubo yokukhiqiza isebenzisa izikhungo zokucubungula ze-CNC kanye nemigqa yokuhlanganisa ezenzakalelayo ukuze kugcinwe amazinga anembile aqinisekisa ukusebenza okungaguquguquki kuyunithi ngayinye. Lokhu kunaka kwemininingwane kusekelwa isitifiketi se-ISO9001, okunikeza amakhasimende isiqiniseko sokuthi umkhiqizo ngamunye uhlangabezana namazinga ekhwalithi aqashelwa umhlaba wonke. Ngaphezu kwalokho, ithimba lobunjiniyela lakwa-Qiaofa lihlala lithuthukisa imiklamo ngokusekelwe empendulweni yasensimini kanye nokuhlolwa kwelabhorethri, lifaka izithuthukisi ezenza impilo yesevisi ibe yinde futhi zinciphise ukusetshenziswa kwamandla. Umphumela uwumkhiqizo ongagcini nje ngokuhlangabezana kodwa ovame ukwedlula okulindelwe abasebenzisi bezimboni abafunayo.

Ngaphandle kwekhwalithi yomkhiqizo, i-Qiaofa inikeza izinga lokwenza ngokwezifiso eliyihlukanisa kwabanye abancintisani abaningi. Akuzona zonke izinhlelo zomusi ezisebenza ngaphansi kwezimo ezijwayelekile; ezinye zidinga amazinga engcindezi akhethekile, izinhlobo zokuxhuma, noma izinto zokubhekana noketshezi olugqwalayo noma amazinga okushisa adlulele. I-Yenza ngokwezifisoIsevisi ivumela amaklayenti ukuthi acacise ngqo lokho akudingayo, kusukela ekuxhumaneni ngama-flanged end kuya ezingxenyeni zangaphakathi ze-alloy eyivelakancane. Inkampani futhi ihlinzeka ngemibhalo yobuchwepheshe ephelele, kuhlanganise namajika omthamo, imihlahlandlela yokufaka, kanye nokusekelwa kokuxazulula izinkinga. Kubaphathi bezikhungo kanye namaqembu okuthenga, lokhu kusho ukuthi kuba nokukhathazeka okuncane ngesikhathi sokuqalisa kanye nezindleko eziphansi zobunikazi kuyo yonke impilo yemishini. Uma uhlanganisa izinto zokwakha eziphakeme, ukukhiqiza okuthuthukile, kanye nendlela ebeka iklayenti kuqala, kulula ukubona ukuthi kungani i-Qiaofa isiphenduke umhlinzeki okhethwayo wezixazululo zama-steam trap emhlabeni wonke. Vakashela i-Mayelana Nathi ikhasi ukuze ufunde kabanzi ngomlando namakhono enkampani.

Ama-steam traps akwa-Qiaofa asetshenziswa ezimbonini ezahlukene, ngayinye inezidingo zayo eziyingqayizivele. Ezikhungweni zokuphehla ugesi, ama-steam traps abalulekile ekukhipheni i-condensate emigqeni yokukhipha i-turbine, kuma-feedwater heaters, nasemigqeni yokusabalalisa umusi. Ukwehluleka kulezi zinhlelo kungaholela ekwehleni kokusebenza kahle kwe-turbine, ukulimala kwe-water hammer, nasekuphazamisekeni okubizayo okungalindelekile. Ama-thermodynamic traps nama-Venturi traps akwa-Qiaofa ayasebenza kahle kulezi zimo ezinengcindezi ephezulu nezinga lokushisa eliphezulu. Emkhakheni wokucubungula amakhemikhali, uketshezi oluhlaselayo kanye nokuguquguquka kwemithwalo kudinga ama-traps akwazi ukumelana nokugqwala futhi agcine ukusebenza okuthembekile ngokuhamba kwesikhathi. Ama-mechanical traps akwa-Qiaofa anezinto zangaphakathi zensimbi engagqwali kanye nama-alloy trims angakhethwa ahlinzeka ngokuqina okudingekayo ezinqubweni eziqhubekayo. Izikhungo zokudla neziphuzo nazo ziyazuza ekwakhiweni okuhlanzekile nokonga amandla okunikezwa umugqa wemikhiqizo yakwa-Qiaofa, ikakhulukazi emisebenzini yokubulala amagciwane, yokupheka, neyokomisa. Ezinye izimboni ezivame ukucacisa ama-steam traps akwa-Qiaofa zihlanganisa ezendwangu, ezemithi, i-pulp ne-paper, kanye nokushisisa kwesifunda. Kungakhathaliseki imboni, umgomo uhlala ufana: ukwandisa ukusebenza kahle kwamandla, ukuvikela imishini, nokunciphisa izindleko zokusebenza ngokuphathwa kwe-condensate okuthembekile. Ukuze uthole ukubuka konke okuphelele kwamamodeli atholakalayo, hlolaImikhiqizo ikhasi.

Ukunikeza isibonelo esisodwa esibonakalayo, isikhungo esikhulu se-petrochemical eNingizimu-mpumalanga ye-Asia muva nje sishintshe ama-trap angaphezu kuka-200 agugile ngama-mechanical steam traps e-FT14 kaQiaofa. Umphumela waba ukwehla ngo-12% ekusetshenzisweni komusi kanye nokwehla okukhulu kwezicelo zokulungisa. Imiphumela enjalo ayijwayelekile uma ama-trap ekhwalithi ephezulu ehlanganiswa nezinqubo ezifanele zokuhlola nokuqapha ama-trap. UQiaofa usekela le mizamo ngezincwadi zobuchwepheshe nezeluleko zokusetshenziswa, esiza amakhasimende ukusungula izinhlelo zokulungisa ezibamba izinkinga ngaphambi kokuba zikhule. Ngokuhlanganisa konke kusukela ekukhetheni kokuqala kuya ekusekelweni okuqhubekayo, inkampani iqinisekisa ukuthi ama-steam traps ayo aletha inzuzo ephezulu kakhulu ekutshalweni kwemali phakathi nesikhathi sawo sokusebenza. Inhlanganisela yobunjiniyela obuqinile, ukuhlukahluka okubanzi kwemikhiqizo, kanye nesevisi yamakhasimende ebamba iqhaza yenza uQiaofa abe umlingani othembekile kunoma yisiphi isikhungo esincike kumusi.

Ukukhetha i-steam trap efanele kungenye yezinqumo ezinomthelela omkhulu ongazithathela zona ukuze umshini wakho we-steam usebenze kahle futhi uthembeke. I-trap yekhwalithi ephezulu inciphisa ukumoshakala kwamandla, inciphisa umsebenzi wokulungisa, futhi ivikela imishini ebalulekile engemuva emonakalweni. I-Qiaofa Machinery inikeza izinhlobo eziningi ze-steam trap—ezomshini, ezethemodynamics, kanye ne-Venturi—ngayinye yakhelwe ukusebenza kahle ezimweni ezithile zokusebenza. Ukuzinikela kwale nkampani ezintweni eziphezulu, ukukhiqiza ngokunemba, kanye nezixazululo ezenzelwe ikhasimende kwenze amakhasimende athembe ukuthi atshala imali emikhiqizweni eyakhelwe ukuhlala isikhathi eside. Noma ngabe uphatha isiteshi samandla, indawo yokuhlanza amakhemikhali, noma indawo yokucubungula ukudla, i-Qiaofa inolwazi kanye nobubanzi bemikhiqizo obuhlangabezana nezidingo zakho. Siyakukhuthaza ukuthi uvakashele i-Ikhaya ikhasi ukuze uhlole uhla oluphelele lwemikhiqizo futhi ufunde kabanzi ngalokho okwenza i-Qiaofa ibe ngumholi ekuthuthukisweni kwesistimu yomusi. Ukuze uthole ulwazi lwamuva lwemboni kanye nezibuyekezo zenkampani, hlola Izindaba ikhasi. Xhumana ne-Qiaofa namuhla ukuze uthole izeluleko zochwepheshe futhi uqale uhambo oluya ohlelweni lomusi olusebenza kahle futhi oluthembekile.

I-steam trap iyivalvu ezishintshayo ekhipha i-condensate namagesi angenakuncishiswa ngenkathi ivimbela i-live steam ukuthi ingaphumi. Isebenza ngokwesinye sezinto ezintathu: umehluko wokuminyana (i-mechanical traps), ukushintsha kwezinga lokushisa (i-thermostatic traps), noma i-pressure/velocity dynamics (i-thermodynamic ne-Venturi traps). Indlela esebenza ngayo iyahluka ngokwakhiwa, kodwa umsebenzi oyinhloko uhlala ufana: ukonga amandla nokuvikela imishini ngokuqinisekisa ukuthi i-condensate kuphela ephuma ohlelweni.

I-Qiaofa Machinery inikeza izinhlobo ezintathu eziyinhloko zama-steam trap: ama-steam trap emishini (kufaka phakathi amadizayini e-float ne-inverted bucket), ama-steam trap e-thermodynamic (uhlobo lwe-disc lwengcindezi ephezulu nomusi oshisayo ngokweqile), kanye nama-steam trap e-Venturi (idizayini engenazo izingxenye ezinyakazayo yokususa i-condensate okuqhubekayo). Uhlobo ngalunye lwenzelwe ukusebenza kahle ezinhlobonhlobo zengcindezi, izimo zokugeleza, kanye nezicelo zemboni. Inkampani futhi inikeza izixazululo ezenzelwe izimo zokusebenza eziyingqayizivele.

Ukukhetha kuncike ezintweni ezifana nengcindezi yokusebenza kanye nezinga lokushisa, umthwalo we-condensate, ukuba khona kwe-superheat, ingozi ye-water hammer, kanye nezintandokazi zokunakekela. Isibonelo, izicupho zemishini ezifana ne-FT14 zilungele kakhulu ama-heat exchanger anomthwalo ongaguquki, kuyilapho izicupho ze-thermodynamic zilungele amasistimu anengcindezi ephezulu nomthwalo oguqukayo. Ithimba lobuchwepheshe lakwa-Qiaofa lingabuyekeza amapharamitha esistimu yakho futhi lincomise i-valve ye-steam trap efanele izidingo zakho.

I-FT14 iyisicupho somusi esisebenza ngomshini esenziwe yi-Qiaofa Machinery. Isetshenzisa i-float yensimbi engagqwali ukulawula ukukhishwa kwamanzi asetshenziswayo ezingeni lokushisa komusi, okuyenza ilungele izinhlelo ezidinga ukudluliswa kokushisa okuqhubekayo njengama-heat exchangers, ama-shell-and-tube heaters, nezitsha zokucubungula. I-FT14 yaziwa ngokusebenza kwayo okunembile, ukusebenza kahle kwamandla, nokuqina ezindaweni zemboni ezinzima.

Ukuhlolwa okujwayelekile kwama-trap kuthola ama-trap ahlulekile noma ahlulekayo ngaphambi kokuba abange ukulahleka kwamandla okukhulu noma ukulimala kwemishini. I-trap eyodwa evuzayo yomusi ingachitha izinkulungwane zamadola kuphethiloli ngonyaka, kuyilapho i-trap evinjiwe ingaholela ekushayweni kwamanzi nokuqhekeka kwamapayipi. Izinhlelo zokuhlola—kusetshenziswa izinzwa, izitholi ze-ultrasonic, noma ukuhlolwa ngamehlo—zisiza izikhungo ukuthi zigcine ukusebenza kahle kwesistimu yomusi futhi zinciphise isikhathi sokuvalwa okungalindelekile.

I-Qiaofa isebenzisa insimbi engagqwali esezingeni eliphezulu, ama-alloys amelana nokugqwala, kanye nezinto zokufaka ezingavimbeli izinga lokushisa eliphezulu kuyo yonke imikhiqizo yayo. Ama-mechanical traps afaka ama-floats ne-trim yensimbi engagqwali, kuyilapho ama-thermodynamic traps esebenzisa ama-disc nama-seat materials aqinisiwe ukuze amelane nokuguga. Izinketho ezenzelwe umuntu ziyatholakala ezinhlelweni ezidinga ama-alloys angajwayelekile ukuze zibhekane nezinto ezinolaka noma izimo ezinzima.

Yebo, i-Qiaofa inikeza isevisi yokwenza ngokwezifiso ezinikeziwe evumela amaklayenti ukuthi acacise amazinga okucindezela, izinhlobo zokuxhumana, izinto zokwakha, kanye nobubanzi bomthamo. Ithimba lobunjiniyela lisebenza eduze namakhasimende ukuthuthukisa izixazululo ezihlangabezana nezidingo zangempela zenqubo. Lokhu kuguquguquka kubaluleke kakhulu ezimbonini ezinezimo zokusebenza ezingajwayelekile noma imishini yakudala edinga ubukhulu obuthile bokuxhumana.

Izicupho zomusi ze-Qiaofa zisetshenziswa kabanzi ekukhiqizeni ugesi, ekucubunguleni amakhemikhali, ekuhlanzeni i-petrochemical, ekukhiqizeni ukudla neziphuzo, ezemithi, ezindwangu, i-pulp ne-paper, kanye nezinhlelo zokushisa zesifunda. Noma yisiphi isikhungo esincike kumusi ukuze sishise, sicubungule, noma sikhiqize ugesi singazuza ezixazululweni zezicupho ze-Qiaofa ezisebenza kahle nezihlala isikhathi eside.

I-Qiaofa inesitifiketi se-ISO9001 futhi isebenzisa ukusetshenzwa kwe-CNC, ukuhlanganiswa okuzenzakalelayo, kanye nezinqubo zokuhlola eziqinile kulo lonke inqubo yokukhiqiza. I-trap ngayinye ihlolwa ukusebenza kanye nokuqina kokuvala ngaphambi kokuthunyelwa. Inkampani futhi ithuthukisa ngokuqhubekayo amadizayini ngokusekelwe empendulweni yasensimini kanye nokuhlolwa kwelabhorethri ukuze kuthuthukiswe ukuthembeka nokusebenza kwamandla.

Amashidi edatha yethekhniki, amashadi womthamo, nemihlahlandlela yokufaka ayatholakala kuwebhusayithi ye-Qiaofa. Ikhasi Lemikhiqizo linikeza ukubuka konke kohlu lwemikhiqizo, kuyilapho amakhasi omkhiqizo ngamunye enikeza imininingwane enemininingwane. Ukuze uthole izeluleko eziqondene nokusetshenziswa, ungaxhumana ngqo ne-Qiaofa ngewebhusayithi noma ngocingo ukuze ukhulume nonjiniyela onolwazi.