Dat phin huhg kinh vho dia chinh c6a b lh cbng t6c (hi& 111.1

- Bien dBi trl so" t6c dQ ti rg ii tli b6ng hdt dgn gid tri khi vAo bdnh c6ng tic dat tdn th$t nh6 nnht.

d) Dat phin huhg kinh vho dia chinh c6a b lh cbng t6c (hi& 111.1

Bum chim AGREX 285/4 dZ sir dung h8n hqp bien phip can bang b vh c nen dat hieu quii caọ

bi&n phAp kh5c nhau (hinh

a ) b )

Hinh 111.16.

So đ

4.1.

Giiii

Sq phPt tridn cGa Iinh vuc ky t h u ~ t IBm kin g i n li&n vdi su phdt trign cha nginh ch6i tao miiy cfing n h ~ n h h g tign b6 cha chc ngAnh

kg

vii t ~ . . . ) . ~ b i v6i miy b m chim - mot sin phdm thuQc loai cbng ngh@ cao, thi vgn d$ Ihm kin c6

9

khi

chigm

t3

bam lai phu thuec r$t nhi&u vBo chgt 1umg c6a vbng 1hm kin cu khị

Thi&t b/ Ilm kin c3a cac t ~ c quay c6 thg phen thhnh ccc loai chinh: vbng cao su, gioing cao

su,

d$u cm. J

C i c vbng cao su, gioang cao su v i tCim chan kim loai ~ U U C sir dung chii ygu d6i vdi c8c k&t cgu c 6 s~ rb ri nhb v B 4p sugt h 6 n g l h . Vbng lim kin deng luc vh vbng lam kin'kidu d l u mfit duqc sir dung rQng riii đi vdi c l c miy m6c c6 sq rb ri

nh6 vB ip sufit l h . Ddi vdi c i c k6it cgu may born cKm h u h g dung nhieu vbng Ihm kin ki&u d$u mdt.

Vbng lhm kin ki&u dlu mut c6 c i c

uu

c) C6 tudi tho dhi ngu sii dung d h g k j thugt

d) C6 thd IBrn vi&c v6i di&u ki&n Pp su9t cao (P = lQ-5mm thuy n g b dEn 4 5 0 ~ G / c m ~ ) , nhiet do T = - 200 i

+

+lo0 m/s; ap dung tBt cho cac m6i t m h g chgt Ibng nv6c c6 phu sa, biin, cit vB cic v!t ran khiic.

Loai vbng lhm kin c a khi (VLKCK) y&u c$u cbng sudt nh6 hm nhigu so vdi vbng cao su (VCS) (AN,,,, = 0,l - O,5 ANN,,,) v i c6 th6 sir dung cho t q c c6 kich

thudc l h D = 1500 rnm. Tuy nhien, nhuuc diem cSa vbng lam kin ca

khi

4.2. NguyCn 1y

lhm

4.2.1. Nguykn ly him vi+c ccu vvdng him kin cg khi kigu &'u mut

Vbng lirn kin kieu d8u mut c6 nhi&u dang khlc nhau nhung v& k&t cgu c6 chung m6t s o đ nhu hinh IV. 1

-: Hhlr IV.1. Sop d6 kt?? cdu vdng lam kin ki& dau mht

Truc quay 1 c6 lien k6t ch3t v& vbng Jim kin ca khi the0 nguy&n 19 dLn h6i 4 vh vbng chan 2. B& mat dLu mlit cha vbng lam kin ca khi 4 ti&p xdc v6i vbng ch?n 2 vh 6p chat vho vbng kim loai 3 n6i v6.i v8 mhy 5. Vbng kim Ioai 2 vh 3 tao thlnh cap ma slt ph8ng. Khe hb giila chdng xhc djnh trj sd rb ri cha c h 9 16ng nhm trong

vb mhy v6i Ap sugt P. Chi ti61 4 chinh 1 l chi ti& dhn h6i v h ~ U U C gqi l i vbng lhm kin c a khi cdn dHm b60 dQ ch?t v i kp d$u cb d m len cAc vbng kirn loai 2 vh 3 ngay c i khi co su rung dong l h , t y c quay v i su mbn cha cGp ma s5t. .

4.2.2. Phdn loui vting ldm kin ca khi

C6 thd phPn loai vbng l l m kin co khi dga vAo dBc didm kgt c L ciia chi ti& dPn h8i (hinh lV.2). C i c dac dikm d6 xhc dinh khdng n h h g qua hinh thtic Mn

ngoli m i cii bhn chgt dong lgc ciia vbng 1Brn kin cd

khị

Vbng Iim kin ca khi

1h

Vbng l i m kin c a khi duuc chia thsnh c i c ki&u vbng Ism kin v6i cac chi ti& d i n hdi quay v i c5c chi tie3 d i n hbi tinh dugc trinh bly the0 dang sa

d6 ir

IV.2.

Vbng l i m kin ccr khi vdi chi ti& d i n hdi quay t h u h g lh loai k&t cgu trong c6

co khi vdi chi ti& dan h8i t-31 la loai k&t caIu ngoei duqc lip chat viri p h h phia ngoii

v6

CAc vbng llam kin c a khi c6 th6 k&t hop vdi cic siphon v i c i c vbng lhrn kin hay cic gioang cao su vdi 16 sọ Chc tgrn mPng cao su chi sir dung dBi vdi cic chi

ti& dhn hdi tlnh vi kic h thudc h u h g tarn I h .

Vbng l l m kin co khi c6 th6 c6 k&t cgu d m hơc kkp. Loai k&t cgu kkp thulmg sir dung cho cbc van ch+n vdi chgt 16ng c6 i p su9't l h h m Ap suift chgt lbng b phia tm6c gioiing l i Ap

= 0,5

< I

Kidu phfa

I I

trong

I 1

V6i k& cgu

siphon

V6.i chi ti& din hBi tinh

V d vbng kjn-~ lo@ hay vbng cao su ki&u k&p

&

~ i 6 u phia

I I

I

kiku dun

=&

&

-

V6i kei cslu v6i k&t cslu

v6.1

1

1

' 1

@

2ii-

Xem xtt cAc yQ t6 Bnh h u h g den t h g loai vbng lam kin c a khi c6 thd tdng

h q the0 4 nh6m sau:

- Nh6m I: Chc vbng lam kin cho chc m6i t h g binh t h u h g (nudc, d h ma hay cic s i n phdm dAu).

-

.

-

hqp cimg nhu bun, cit, cBc bom gigng sau, barn dung djch gigỵ

-

C i c thOnp s6 ky thubt quan trqng c h luu

9

kU

vdng llm kin

ca khi

1Brn

cha hp sugt

(p)

đi vdi c i c vbng 11m kin ca khị Chc th6ng s6 kjj thugt c6a 4 nh6m k6t c$u vbng lhm kin c a

khi

JY.

Bdng 1V.Ị Cdc thBng

s$kE

4.3.

cgu ciia

TT

1

2

3

4

4.3. I . Vbng him

kin

Loai vbng lhm kin ca khi nh6m I,

II

chim kidu ly tam vh dbng chko, cAc miiy bom thd tich kidu binh rang, ttyc vit. Nhom I LI 111 IV P ( ~ G l c m ~ ) I 1

<

Xac dinh thong

so

. Nh6 nhgt Nh6 nhgt Trung binh Cao Cao nhát

v

>

>

Chc vbng lhm kin loai nhy duuc sin xugt v6i cc8c siphon cao su, chc t$m mhng

cao su hay vbng kim loai vdi chc vbng lb so &n h8ị Chc chi ti& dhn h8i c6 . ~ & la

quay ( t ~ c ) hay tinh (vb may)

(hinh

d? T = - 10 t + l O o O ~ ,

s6

Hinh W.3. V d n g l a m kin v& siphon Hinh IV.4. V6ng lam kin v& t h

can su g u q mdng cao su