1. Kev ceev faj rau kev vuam ua haujlwm
Thaum vuam, kev ua haujlwm yuav tsum tau ua raws li cov kauj ruam, txwv tsis pub, qhov zoo ntawm kev vuam yuav raug cuam tshuam.
(1) Qhov chaw ntawm cov yeeb nkab fittings uas yuav tsum tau welded yuav tsum huv si los yog flared. Lub qhov ncauj flared yuav tsum du, puag ncig, tsis muaj burrs thiab tawg, thiab sib npaug hauv tuab. Txhuam cov pob qij txha yeeb nkab tooj liab uas yuav tsum tau welded nrog sandpaper, thiab thaum kawg so lawv nrog daim ntaub qhuav. Txwv tsis pub nws yuav cuam tshuam rau cov solder ntws thiab soldering zoo.
(2) Muab cov kav dej tooj liab uas yuav tsum tau vuam sib tshooj (ua tib zoo saib qhov loj me), thiab teeb tsa qhov nruab nrab ntawm lub voj voog.
(3) Thaum vuam, cov khoom vuam yuav tsum tau preheated. Sov lub vuam ntawm cov yeeb nkab tooj liab nrog nplaim taws, thiab thaum cov yeeb nkab tooj liab raug cua sov rau xim av-liab, siv lub electrode nyiaj los vuam nws. Tom qab nplaim taws raug tshem tawm, cov solder raug leaned rau ntawm qhov sib koom ua ke, yog li cov solder yaj thiab ntws mus rau hauv cov khoom tooj liab soldered. Qhov kub tom qab cua sov tuaj yeem cuam tshuam qhov kub los ntawm xim.
(4) Nws yog qhov zoo tshaj plaws los siv lub nplaim taws muaj zog rau kev vuam sai, thiab luv lub sijhawm vuam ntau li ntau tau kom tiv thaiv cov oxides ntau dhau los ntawm kev tsim tawm hauv cov kav dej. Cov oxides yuav ua rau cov av thiab thaiv raws qhov ntws ntawm cov tub yees, thiab txawm tias ua rau muaj kev puas tsuaj loj rau lub compressor.
(5) Thaum soldering, thaum lub solder tsis tau khov tag, tsis txhob co lossis co lub yeeb nkab tooj liab, txwv tsis pub qhov soldered yuav muaj kab nrib pleb thiab ua rau xau.
(6) Rau lub tshuab tub yees uas muaj R12 puv, nws tsis raug tso cai rau vuam yam tsis tau nchuav cov tub yees R12, thiab nws tsis tuaj yeem ua qhov kho vuam thaum lub tshuab tub yees tseem xau, txhawm rau tiv thaiv cov tub yees R12 kom tsis txhob muaj tshuaj lom vim yog nplaim taws qhib. Phosgene yog tshuaj lom rau tib neeg lub cev.
2. Txoj kev vuam rau ntau qhov chaw sib txawv
(1) Kev vuam ntawm cov yeeb nkab fittings uas muaj qhov ntev
Thaum vuam cov kav dej tooj liab uas muaj tib lub cheeb hauv lub tshuab tub yees, siv cov hlau vuam casing. Ntawd yog, cov kav dej vuam raug nthuav dav mus rau hauv lub khob lossis lub qhov ncauj, thiab tom qab ntawd lwm cov kav dej raug ntxig. Yog tias qhov ntxig luv dhau, nws yuav tsis tsuas yog cuam tshuam rau lub zog thiab qhov nruj, tab sis kuj tseem yuav yooj yim ntws mus rau hauv cov kav dej, ua rau muaj kuab paug lossis thaiv; yog tias qhov sib txawv ntawm cov kav dej sab hauv thiab sab nraud me dhau, cov kua dej tsis tuaj yeem ntws mus rau hauv qhov chaw ntim thiab tsuas yog tuaj yeem vuam rau sab nraud ntawm qhov sib txuas. Lub zog tsis zoo heev, thiab nws yuav tawg thiab xau thaum raug kev co lossis lub zog khoov; yog tias qhov sib txawv loj dhau, cov kua dej yuav yooj yim ntws mus rau hauv cov kav dej, ua rau muaj kuab paug lossis thaiv. Tib lub sijhawm, qhov xau yuav tshwm sim los ntawm cov kua dej tsis txaus hauv qhov vuam, tsis yog tsuas yog qhov zoo tsis zoo, tab sis kuj yog kev pov tseg ntawm cov khoom siv. Yog li ntawd, nws yog ib qho tseem ceeb heev uas yuav tsum xaiv qhov ntev ntawm qhov ntxig thiab qhov sib txawv ntawm ob lub kav dej kom tsim nyog.
(2) Vuam cov raj capillary thiab cov raj tooj liab
Thaum kho lub tshuab lim dej ntawm lub tshuab tub yees, lub raj capillary (lub raj throttle capillary) yuav tsum tau welded. Thaum lub capillary raug welded rau lub tshuab lim dej lossis lwm cov kav dej, vim muaj qhov sib txawv loj ntawm ob lub kav dej, lub peev xwm cua sov ntawm lub capillary yog me me heev, thiab qhov tshwm sim ntawm overheating yog qhov yooj yim heev rau kev nce cov metallographic noob ntawm lub capillary, uas ua brittle thiab yooj yim tawg. Txhawm rau tiv thaiv lub capillary los ntawm overheating, lub nplaim taws vuam roj yuav tsum zam lub capillary thiab ua rau nws mus txog qhov kub vuam tib lub sijhawm nrog lub raj tuab. Ib qho clip hlau kuj tseem siv tau los clamp ib daim ntawv tooj liab tuab ntawm lub raj capillary kom nce thaj chaw cua sov kom raug kom tsis txhob overheating.
(3) Vuam cov raj capillary thiab lim dej qhuav
Qhov tob ntawm cov capillary yuav tsum tau tswj hwm hauv thawj 5-15 hli, qhov kawg ntawm cov capillary thiab lub tshuab ziab lim dej yuav tsum yog 5 hli ntawm qhov kawg ntawm lub lim dej, thiab qhov sib phim yuav tsum yog 0.06 ~ 0.15 hli. Qhov kawg ntawm cov capillary zoo tshaj plaws ua rau hauv lub kaum sab xis 45 ° zoo li tus nees kom tiv thaiv cov khoom txawv teb chaws kom tsis txhob nyob ntawm qhov kawg thiab ua rau txhaws.
Thaum ob lub yeeb nkab txoj kab uas hla sib txawv heev, lub tshuab ziab lim dej kuj tseem tuaj yeem raug tsoo nrog lub yeeb nkab clamp lossis lub vise kom tiaj tus yeeb nkab sab nraud, tab sis lub capillary sab hauv tsis tuaj yeem nias (tuag). Ntawd yog, ntxig lub raj capillary rau hauv lub raj tooj liab ua ntej, thiab nias nws nrog lub yeeb nkab clamp ntawm qhov deb ntawm 10 hli ntawm qhov kawg ntawm lub raj tuab.
(4) Kev vuam cov yeeb nkab txias thiab cov yeeb nkab compressor
Qhov tob ntawm cov yeeb nkab txias uas ntxig rau hauv cov yeeb nkab yuav tsum yog 10 hli. Yog tias nws tsawg dua 10 hli, cov yeeb nkab txias yuav yooj yim txav mus rau sab nraud thaum lub sijhawm cua sov, ua rau cov kua dej txhaws lub nozzle.
3. Kev tshuaj xyuas qhov zoo ntawm vuam
Yuav kom ntseeg tau tias tsis muaj qhov xau ntawm qhov welded, kev tshuaj xyuas tsim nyog yuav tsum tau ua tom qab welding.
(1) Xyuas seb qhov kev ua haujlwm sealing ntawm lub vuam puas zoo. Tom qab ntxiv cov tub yees lossis nitrogen kom ruaj khov rau ib lub sijhawm, nws tuaj yeem sim nrog dej xab npum lossis lwm txoj hauv kev.
(2) Thaum lub tub yees thiab cua txias ua haujlwm, yuav tsum tsis txhob muaj qhov tawg (seams) hauv qhov chaw vuam vim yog kev co.
(3) Cov kav dej yuav tsum tsis txhob raug thaiv vim muaj cov khib nyiab nkag mus thaum lub sijhawm vuam, thiab nws yuav tsum tsis txhob nkag mus rau hauv cov dej noo vim yog kev ua haujlwm tsis raug.
(4) Thaum lub tub yees thiab cua txias ua haujlwm, qhov chaw ntawm qhov vuam yuav tsum huv thiab tsis muaj cov roj av.
Lub sijhawm tshaj tawm: Lub Kaum Hli-23-2021