DLLA149P174 Roj Txhaj Nozzle - Orifice Geometry Optimized Rau Txau Ntsig & Combustion Stability nyob rau hauv High-Pressure Common-Rail Systems

Nyob rau hauv ib tug common-rail system, lub cev injector muab lub siab, tab sis lubnozzleyog qhov twg roj hloov los ntawm cov kua kem mus rau hauv ib qho reactive aerosol. CovTIAB SA 149P174tsis yog ib qho generic orifice phaj - nws yog ib tug precision-engineered flow-tswj lub ntsiab uas nws lub qhov suav, txoj kab uas hla, thiab tawm lub kaum sab xis yog calibrated kom phim cov piston tais geometries thiab boost pressures. Tsis yog tsuas yog cov roj atomising xwb, lub nozzle tswj cov tshuaj tsuag nkag mus thiab cov xa dej me me, kom ntseeg tau tias txhua qhov roj parcel mus txog qhov nplaim taws pem hauv ntej ntawm txoj cai tshaj tawm thiab lub kaum sab xis - qhov tseem ceeb rau kev txo qis thiab thermal efficiency.

DLLA149P174 siv tus qauvDLLA mounting xov (M14 × 1.5)thiab qhov projection ntev ntawm24 mm, ua rau nws hloov ncaj qha rau:

Bosch-style injector lub cev siv hauv Cummins ISX / ISZ

MAN D20 / D26 cav

Scania DC9 / DC13 (thaum ntxov Euro V)

Suav qauv: Weichai WP10, WP12, Yuchai YC6L, Xichai 6DL

Off-highway applications nrog DEUTZ lossis Perkins common-rail engines

Nco ntsoov: Lub nozzle yog qhov sib hloov tau nrog DLLA149P170 thiab P172, tab sis cov chav kawm kam rau siab ntawm P174 yog nruj dua (± 3% vs ± 5%). Ib txwm phim tag nrho rau (lossis yim) lub tog raj kheej nrog tib P-chav kawm kom tsis txhob muaj qhov sib npaug ntawm lub tog raj kheej.

Vim hais tias lub nozzle yog ib qho kev pabcuam tshwj xeeb, kev sib dhos kom zoo nrog lub cev txhaj tshuaj yuav tsum tau saib xyuas:

Tightening torque: 70 N·m rau lub nozzle tuav cov txiv ntoo (qhuav, tsis muaj roj nplua nyeem ntawm cov xov).

Koob lift shim: Txheeb xyuas qhov tuab ntawm shim uas twb muaj lawm; Yog tias hloov lub nozzle nkaus xwb, khaws cov khoom qub kom tswj tau qhov nqa.

Sealing nto: Lub nozzle lub conical lub rooj yuav tsum tsis txhob khawb - siv lub nplhaib tooj liab tshiab yog siv tau.

Tom qab installation, ua ibkev ntsuam xyuas dejnrog lub injector ntawm lub rooj ntev zaum: cov roj rov qab yuav tsum tsis pub tshaj 15 ml / min ntawm 100 MPa; Cov txiaj ntsig siab dua qhia tau tias tsis siv lub rooj zaum ntawm rab koob lossis lub ntug qhov rooj puas.

Ntau cov tom qab nozzles luam tawm qhov loj me tab sis tsis saib xyuas qhov nkag-ntug curvature thiab qhov tseeb ntawm qhov tseeb. DLLA149P174 tau txheeb xyuas los ntawmhigh-speed tshuaj tsuag duabthiabflow-bench pairing-Txhua chav tsev raug sim rau orifice symmetry, kom ntseeg tau tias txhua cov tshuaj tsuag plume nqa cov roj sib npaug. Qhov no tshem tawm cov kev hloov pauv ntawm lub tog raj kheej-rau-lub tog raj kheej uas ua rau cov pa luam yeeb dawb ntawm qhov tsis ua haujlwm thiab kev siv roj ntau dhau ntawm kev thauj khoom siab. Tsis tas li ntawd, lub cev nozzle tiv thaiv los ntawm amanganese phosphate txheej, uas tiv thaiv corrosion thaum lub sij hawm cia thiab resists me ntsis galling thaum lub sij hawm installation.

Parameter	Tus nqi
Static flow @ 100 MPa	420 cm³ / 30s (± 3%)
Koob nqa	0.28mm ib
Txhaj qhov suav	5
Txau lub kaum sab xis	149 degree
Sac ntim	0.65 mm³ (txo kom txo qis tom qab txhaj tshuaj dribble)
Kev khiav hauj lwm qhov kub thiab txias	-40℃rau +150℃(fuel wetted)

Covhydraulic flow ratetseem tawm mus txog 200 MPa, nrog rau qhov tsis txaus ntseeg saturation - ua pov thawj rau kev ua tib zoo tsim nozzle nkag geometry. Ntawm cov txheej txheem kev txhaj tshuaj (≈3 mm³ / str), cov roj me me tau xa nrog lub tee Sauter Mean Diameter (SMD) ntawm kwv yees li 18 µm, uas txhawb nqa cov evaporation sai thiab txo qis suab nrov. Nyob rau hauv tag nrho cov load, cov tee loj (SMD ~ 25 µm) ua tau txaus nkag mus siv lub piston lub squish cheeb tsam tsis wetting lub tog raj kheej liner.

Q1: Kuv puas tuaj yeem siv DLLA149P174 los hloov DLLA149P172 ncaj qha yam tsis hloov ECU?
Yog - lawv qhia tib lub kaum sab xis thiab lub qhov taub. Txawm li cas los xij, P174 muaj qhov ua siab ntev me ntsis, uas tuaj yeem hloov pauv roj los ntawm kwv yees li 0.5%. Feem ntau ECUs nrog kev kawm hloov pauv (xws li Bosch EDC17) yuav them nyiaj hauv 20–50 km ntawm kev tsav tsheb. Kom tau txais txiaj ntsig zoo, peb pom zoo kom siv tib P-chav kawm ntawm txhua lub tog raj kheej.

Q2: Kuv tuaj yeem pom qhov pom kev kuaj lub nozzle rau hnav yam tsis muaj lub rooj zaum kuaj?
Tshem lub nozzle thiab saib ntawm lub qhov rooj nrog lub 10 × magnifier. Cov cim ntawm kev hnav muaj xws li: sib npaug los yog chipped inlet npoo, carbon buildup ib nrab thaiv lub qhov, los yog ib tug oval deformation ntawm lub qhov hluav taws xob. Lub taub hau noj qab haus huv qhia tau hais tias ntse, huv qhov uas tsis pom burrs. Yog hais tias lub qhov tshwm sim loj los yog lub hnab ntim tau pitted, hloov lub tsev.

Q3: Lub cav pib zoo tab sis emissions dub pa luam yeeb nyob rau hauv acceleration - lub nozzle puas yog tus txhaum?
Yog - cov pa luam yeeb dub feem ntau qhia tias muaj roj ntau dhau lossis tsis zoo atomisation. Nrog lub nozzle, xyuas cov qauv tshuaj tsuag los ntawm lub rooj zaum-kuaj ntawm 100 MPa; Yog tias koj pom cov kwj deg es tsis txhob muaj cov pos nphuab zoo, ib los yog ntau lub qhov tau thaiv. Kuj txheeb xyuas qhov qhib siab - yog tias nws poob qis dua qhov teev tseg 29.5 MPa (rau kev sib dhos ua tiav), lub caij nplooj ntoos hlav nozzle yuav tsis muaj zog.

Q4: Puas yog lub nozzle yuav tsum tau ntxuav cov kuab tshuaj tshwj xeeb kom tshem tawm cov kua roj vanish?
Siv cov tshuaj ntxuav ultrasonic nkaus xwb nrog cov tshuaj pH nruab nrab (tsis muaj cov kua qaub hnyav). Teem lub zaus rau 40 kHz thiab lub zog kom tsawg dua lossis sib npaug li 80 W / L. Soak rau 10-12 feeb, ces yaug nrog huv si diesel. Tsis txhob txhuam cov hlau los yog cov cuab yeej abrasive - lawv yuav rhuav tshem lub qhov hluav taws xob nkag. Peb pom zoo kom ua haujlwm tu txhua txhua 150 000 km yog tias khiav ntawm cov roj sulfur siab.

Q5: Lub neej ntev npaum li cas ntawm DLLA149P174 nyob rau hauv lub luag haujlwm hnyav (tswj lossis kev tsim kho) yog dab tsi?
With proper filtration (5‑µm absolute) and fuel water separation, the nozzle can exceed 300 000 km. In extremely dusty environments, change fuel filters twice as often – abrasive particles accelerate orifice erosion. Monitor the return flow rate: if it increases by >20% los ntawm cov tshiab, lub nozzle yog zoo li yuav tsum tau hloov.

Q6: Kuv muaj ib lub nkoj sib xyaw ntawm Euro III thiab Euro V cav - puas yog lub nozzle haum rau ob qho tib si?
DLLA149P174 feem ntau yog optimized rau Euro IV-V siab ntau yam (160-190 MPa). Rau Euro III cov tshuab khiav ntawm kev tsheb nqaj hlau qis (120-150 MPa), cov tshuaj tsuag nkag tuaj yeem luv me ntsis, uas tuaj yeem cuam tshuam rau kev sib tsoo hauv qee lub cav. Peb pom zoo kom siv lub nozzle nkaus xwb rau cov tshuab tsim rau ntau dua lossis sib npaug ntawm 160 MPa kom tau txais txiaj ntsig tag nrho ntawm nws cov tshuaj tsuag geometry.

 

Txhawm rau ua kom koj qhov kev yuav khoom tau yooj yim thiab yooj yim, peb muab ntau yam kev xaiv them nyiaj ruaj ntseg:

Peb nyob ntawm no los ua kom koj cov txheej txheem xaj kev txhawj xeeb-dawb - xaiv txoj kev them nyiaj uas ua haujlwm zoo tshaj rau koj!

 

 

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