Kev teeb tsa thiab kev sib piv ntawm chiller expansion valve

1. Kev sib tw

Raws li qhov tsis kam ntawm R, Q0, t0, tk, cov kav dej ua kua thiab lub valve, cov kauj ruam yog:

Txiav txim siab qhov sib txawv ntawm ob qhov kawg ntawm lub expansion valve;

Txiav txim siab daim ntawv ntawm lub valve;

Xaiv cov qauv thiab specification ntawm lub valve.

1. Txiav txim siab qhov sib txawv ntawm ob qhov kawg ntawm lub valve:

ΔP = PK-ΣΔPi-Po(KPa)

Hauv cov qauv: PK―― condensing siab, KPa, ΣΔPi――is ΔP1 + ΔP2 + ΔP3 + P4 (ΔP1 yog qhov tsis kam ntawm cov yeeb nkab ua kua; ΔP2 yog qhov tsis kam ntawm lub luj tshib, valve, thiab lwm yam.; ΔP3 yog qhov nce ntawm cov kav dej siab poob, ΔP3 = ρɡh; ΔP4 yog qhov tsis kam ntawm lub taub hau dispensing thiab dispensing capillary, feem ntau yog 0.5bar txhua); Po-evaporating siab, KPa.

2. Txiav txim siab daim ntawv ntawm lub valve:

Qhov kev xaiv ntawm qhov sib npaug sab hauv lossis sab nraud yog nyob ntawm qhov kev poob siab hauv cov evaporator. Rau R22 system, thaum lub siab poob siab tshaj qhov sib thooj evaporation kub los ntawm 1 ° C, yuav tsum tau siv ib qho kev sib npaug thermal expansion valve.

3. Xaiv cov qauv thiab specification ntawm lub valve:

Raws li Q0 thiab xam ΔP ua ntej thiab tom qab lub expansion valve thiab evaporation kub t0, xyuas lub valve qauv thiab valve muaj peev xwm los ntawm lub rooj sib tham. Txhawm rau kom yooj yim cov txheej txheem sib txuam, nws kuj tuaj yeem ua raws li kev ntsuas kev tsim qauv. Cov qauv thiab cov kev qhia tshwj xeeb ntawm cov thermal expansion valve uas twb muaj lawm yuav tsum yog raws li hom refrigerant siv nyob rau hauv lub tub yees system, qhov ntau ntawm evaporating kub thiab qhov luaj li cas ntawm tshav kub load ntawm lub evaporator. Kev xaiv yuav tsum ua raws li cov cai hauv qab no:

(1) Lub peev xwm ntawm qhov xaiv thermal expansion valve yog 20-30% loj dua qhov tseeb thermal load ntawm evaporator;

(2) Rau cov tshuab tub yees uas tsis muaj cov dej txias ntim tswj lub valve lossis cov dej txias txias yog qhov qis rau lub caij ntuj no, thaum xaiv lub thermal expansion valve, lub peev xwm ntawm lub valve yuav tsum yog 70-80% loj dua li cov evaporator load, tab sis qhov siab tshaj plaws yuav tsum tsis pub tshaj 2 ntawm lub evaporator thaum tshav kub kub load. Sijhawm;

(3) Thaum xaiv lub thermal expansion valve, lub siab poob ntawm lub raj xa dej yuav tsum raug xam kom tau txais qhov sib txawv ntawm lub siab ua ntej thiab tom qab lub valve, thiab tom qab ntawd cov ntsiab lus ntawm lub thermal expansion valve yuav tsum tau txiav txim siab raws li qhov kev nthuav dav valve suav. lub rooj muaj peev xwm muab los ntawm cov chaw tsim khoom.

Ob, installation

1. Tshawb xyuas seb nws puas zoo ua ntej kev teeb tsa, tshwj xeeb tshaj yog ib feem ntawm qhov ntsuas qhov ntsuas kub;

2. Lub installation qhov chaw yuav tsum nyob ze rau ntawm lub evaporator, thiab lub valve lub cev yuav tsum tau ntsia vertically, tsis inclined los yog upside down;

3. Thaum txhim kho, ua tib zoo saib xyuas cov kua hauv qhov ntsuas qhov ntsuas kub hauv lub hnab ntsuas kub txhua lub sijhawm, yog li lub hnab ntsuas kub yuav tsum tau nruab qis dua lub valve lub cev;

4. Lub ntsuas kub yuav tsum tau nruab rau ntawm kab rov tav cov yeeb nkab ntawm qhov hluav taws xob ntawm cov evaporator kom ntau li ntau tau, thiab feem ntau nws yuav tsum nyob deb tshaj li 1.5m ntawm qhov chaw nres nkoj nqus ntawm compressor;

5. Lub hnab ntsuas kub yuav tsum tsis txhob muab tso rau ntawm lub raj xa dej nrog effusion;

6. Yog hais tias lub qhov hluav taws xob ntawm lub evaporator muaj ib tug gas-kua exchanger, lub kub sensing pob feem ntau yog nyob rau hauv lub qhov hluav taws xob ntawm lub evaporator, uas yog, ua ntej lub tshav kub exchanger;

7. Qhov ntsuas kub ntsuas kub feem ntau yog muab tso rau ntawm cov yeeb nkab xa rov qab ntawm cov evaporator thiab qhwv nruj nreem rau ntawm phab ntsa ntawm cov yeeb nkab. Qhov chaw tiv tauj yuav tsum tau ntxuav ntawm oxide nplai, nthuav tawm cov xim hlau;

8. Thaum txoj kab uas hla ntawm cov yeeb nkab xa rov qab yog tsawg dua 25 hli, lub hnab ntsuas kub tuaj yeem khi rau sab saum toj ntawm cov yeeb nkab xa rov qab; thaum txoj kab uas hla yog ntau tshaj 25 hli, nws tuaj yeem khi ntawm 45 ° ntawm sab qis ntawm cov yeeb nkab xa rov qab los tiv thaiv cov khoom xws li cov roj tsub zuj zuj hauv qab ntawm cov yeeb nkab los ntawm kev cuam tshuam qhov kev xav. Qhov tseeb ntawm qhov ntsuas kub.

Peb, debugging

1. Teem lub ntsuas kub ntawm qhov hluav taws xob ntawm lub evaporator lossis siv lub tshuab nqus tsev los xyuas qhov degree ntawm superheat;

2. Lub degree ntawm superheat yog me me heev (kua mov yog loj dhau), thiab lub adjusting pas nrig rotates ib nrab ib tug tig los yog ib tug tig clockwise (uas yog, nce lub caij nplooj ntoos hlav quab yuam thiab txo lub valve qhib), thaum lub refrigerant txaus; Kev kho tus pas nrig tig ib zaug Tus naj npawb ntawm cov lem yuav tsum tsis txhob ntau dhau (qhov kho cov pas nrig xov tig ib tig, lub superheat yuav hloov li ntawm 1-2 ℃), tom qab ntau qhov kev hloov kho, kom txog rau thaum cov kev xav tau ua tiav;

3. Empirical adjustment method: Tig lub ntsia hlau ntawm tus pas nrig kho kom hloov qhov qhib ntawm lub valve, kom cov dej khov los yog cov dej khib nyiab tuaj yeem tsim sab nraum cov yeeb nkab rov qab ntawm cov evaporator. Rau cov khoom siv tub yees nrog cov evaporation kub hauv qab 0 degrees, yog tias koj kov nws nrog koj txhais tes tom qab frosting, koj yuav muaj qhov txias ntawm koj txhais tes. Lub sijhawm no, qhov qhib degree yog tsim nyog; rau qhov evaporation kub siab tshaj 0 degrees, qhov condensation tuaj yeem raug txiav txim siab qhov xwm txheej.