- Bien dBi trl so" t6c dQ ti rg ii tli b6ng hdt dgn gid tri khi vAo bdnh c6ng tic dat tdn th$t nh6 nnht.
3.5. l'inh to6n 6ng xH mhy born chim
Sau khi ra khbi b6nh cbng tAc, dbng chHy the0 he th6ng Bng d i n tholt ra
- Dhm bio dbng đi x h g qua t v c khi ra khbi bhnh cbng tic v i tao chuygn dong tlrong d6i Bn d m ciia dbng chHy ir vhng b6nh cbng tic.
- Bign dong nang cfia dbng chhy sau khi ra khbi bhnh cbng thc thhnh hp nang. - bi& d6i dong ning thlnh hp ning phHi d h blo khbng phl su d6i ximg qua
t q c ciia dbng chiy khi ra kh6i binb cbng tic. Trong t n s h g h* n g u c lai sE xugt hi&n them tBn t h n thiiy lqc v l lhrn giHm hi&u sugt mhy b m . Dai Iuqng tumg d8i c6a c0t nudc tao thlnh hp luc b r5nh x i c6 th6 xhc d w the0 c0ng thi3c:
d day: p" - H& s6 phiin 1~ cfia clnh binh c0ng tic
H , - Cct nudc dbng
H , - Cot nudc tinh (Ap luc)
R 6 ring, hf! s6 p h h l ~ c p" chng nhb thi phdn cot nudc b rinh x i bign t h k h hp luc chng 161-1 vh sv hohn thicn thby Iuc c6a c h h g chng c6 hnh h u h g Ihdgn hifsu sugt mhy born ( t h u h g dat 25 + 33% c$t nudc cha bAnh cbng tAc bign t h h h i p luc), do vgy, 6ng xA d6ng vai trb quan trong c6a phhn d h dbng mhy bum.
V& nguy&n tic c6 hai loai 6ng xH:
- Ciic rinh phBn d i n dbng nam gan liibn vdi than v6 miiy bum
- Chc Anh llm tlch ri&ng theo k i h buBng xoin hay ki6u cinh dAn
V6i quan diem thiiy lqc thi dng xH kigu budng xoin (hidIl1.lOa) vh kigu chnh dAn (hinh 11ỊlOb) khbng c6 gi d*c biet khhc nhaụ Tuy nhi&n, chiing c6 dac di&m k&'t cgu c0ng nghe khhc nhaụ
~ i & u 6ng x i xoin cho phCp dbng chHy thuw idi h m , nhmg gia c0ng cic r%nh lai r$t kh6 khan. Hinh dhng, kich thudc vh dQ n h h b& mpt cha 6ng xA x o h phu thu0c vio c0ng ngh& d ~ c . ~ i & u 6ng x i cAnh d h th u h g lh rai v l ti& di&n t h u h g c6 hinh chi3 nh$t nen cho ph6p gia cbng c a khi mgt, m3c du di$u kien thiiy luc lai k6m h m .
Trung t&n AGRIMECAD d i nghiCn c h thigt kk&' loai dng xh x o b dc va 6ng xH chnh dan. K&t quH nghi&n ciru cho thgy 6ng xH k i h xoan sE cho hi&u suat cao
h m vi trinh 60 dlic cGa ta khb cao, dieu ki&n thdy luc cha dng x i xohn bc t6t hon (hinh 111.1 Oa).
Qub trinh chuydn tbc do dbng chHy thhnh bp nang xAy ra b bu6ng x o h . Vgn t6c dhng b ti& di&n 'Yr8ng" budng xoin ldn h m nhi&u so vdi van t6c tmng 6ng-Tigp
66 giAm V@I t6c v l chuydn van t6c 66 thhnh hp ning tai 6ng loẹ Nghia la, phAi thigt kb 6ng x l sao cho mbmen van tBc b ti&t di&n ra cha n6 kh6ng tbn tai nuạ