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1
Khoa K Thut Giao Thng B Mn K Thut Hng Khng
TH NGHIM K THUT GIAO THNG 1
Th nghim thy lc ng c tnh ca bm
1. Mc ch th nghim Tm ra ng c tnh ca my bm ( th lu lng Q p sut P) bng thc nghim.
2. Ni dung Bm thy lc c tc dng chuyn c nng ca bm thnh p nng. Cc c tnh chung ca bm l : Lu lng, p sut, Hiu sut, tc quay ca bm, nht Loi bm dng trong th nghim l bm bnh rng ngoi (Gear pump with external gearing), l loi bm m lu lng ca n mt ch quay xc nh l hng s. Nhng thc t, ng c tnh lu lng c gim cht t do s chnh lch p sut ming ht v u ra ca bm (gy mt mt lu lng). Bi th nghim s dng cc thit b :
- Van tit lu DF2
- ng h o p
- ng h bm gi
3. Trnh t th nghim Cc i lng cn o :
- Thi gian bm (giy) c lu lng 1.5L (t mc 0.5L n 2L trong bnh do lu lng) Lu lng Q, n v : lt/s.
- p sut P, n v : N/m2
Ch :
- Thao tc nhanh gim bt tc ng hin tng nng ln ca du
2
Bc 1: Ni cc ng ng vi thit b, t ng ra ca bm van tit lu bnh o lu lng
Bc 2: Bt cng tc cu dao ch I. Bc 3: iu chnh van tit lu. Bc 4: Bm nt khi ng my bm, tin hnh bm ng h o thi gian trong khong mc du trong bnh o lu lng t 0.5L n 2L.
Bc 5: Tt bm, m kha x du. Bc 6: Lp li th nghim vi cc v tr van tit lu khc nhau.
3
4. Kt qu th nghim v X l kt qu mi mc van tit lu, thc hin do thi gian bm 1.5L du 2 ln, tnh lu lng bm ri ly gi tr trung bnh ca 2 ln o.
Mc van Th tch o
Thi gian bm
p sut
Lu lng
Lu lng trung bnh
1 1.5
1.5
2 1.5
1.5
3 1.5
1.5
6 1.5
1.5
9 1.5
1.5
12 1.5
1.5
15 1.5
1.5
th ng c tnh Q P t kt qu thc nghim: