Can dien tu

Trong khi do, MAY NEN KHI loai ly tam co nguyen ly lam viec khac han. Trong truong hap nay, su gia tang ap suat phu thuoc chu yeu vao su bien doi tu ap suat dong sang ap suat tinh. Hinh 6.5 trinh bay cau tao cua mot may nen lanh loai ly tam. Khi khao sat moi tucmg quan ve vi tri giua may nen va dong co dan dong, ta co the phan may nen lanh thanh cac loai sau: - Loai kin (hermetic compressor): trong truong hop nay may nen va dong co duoc bo tri chung trong mot vo may. Uu diem cua loai nay la giam den muc toi da su ro ri cua tac nhan lanh ra moi truong va dong co co the duoc giai nhiet bang chinh hoi tac nhan lanh di vao dau hut cua may nai, chinh vi vay to hop dong co - may nen loai nay co kich thuoc nho gon va gia thanh re lim. Thong thuong nguoi ta dung may nen kin cho cac truong hop co cong suat nho hon mot 1 HP cho den khoang 24 HP (hirth 6.6 a). - Loai nua kin (semihermetic compressor) : hinh 6.6b trinh bay so do cua may nen loai nua kin. Ta thay trong truong hop nay dong cu va may nen cung duoc dat rat gan nhau. Ngoai nhung uu diem da noi o truong hop may nen loai kin, o may nen nua kin con co them mot uu diem noi bat la ta co the thuc hien mot so sua chua can thiet hoac bao tri may nen. Thong thuong nguoi ta hay dung may nen loai nua kin cho cac truong hop co nang suat lanh trung binh. - Loai ho (open compressor): o truong htTp nay may nen va dong ca hoan toan rieng biet voi nhau. Noi chung, nguoi ta khong dung tac nhan lanh bay hoi de lam mat cuon day cua dong co, thong thuong nguoi ta dung gio. So voi loai may nen kin thi may nen loai ho co the tiet kiem tu 2% den 4% Iiang luong tieu ton o dau vao. Van de can chu y o day la co gang lam kin truc (chen truc) de giam bot su ton that tac nhan lanh. Thong thuong nguoi ta dung may