Vong bi quat cong nghiep la nhom vong bi chiu tai nang, van hanh lien tuc trong cac he thong thong gio, lam mat va hut bui tai nha may. Quat cong nghiep ID (Induced Draft) va FD (Forced Draft) doi hoi vong bi co kha nang chiu nhiet, chong rung va tuoi tho cao. Lua chon sai vong bi dan den dung may ngoai ke hoach, ton kem chi phi bao tri.

Cac loai vong bi pho bien cho quat cong nghiep

Tuy theo kich thuoc quat va dieu kien van hanh, ky su thuong chon mot trong ba nhom chinh:

  • Vong bi cau mot day (deep groove): Phu hop quat co tai trong trung binh, toc do cao. Ma pho bien: 6316 C3, 6320 C3.
  • Vong bi du tu lua (spherical roller): Chiu tai nang, tu dong dieu chinh do lech truc. Ma pho bien: 22320 E, 22324 EK.
  • Vong bi do (cylindrical roller): Tai trong huong tam lon, thich hop quat ID cong suat tu 200 kW tro len.
Thong so 6316 C3 22320 E NU 320 ECJ
Duong kinh trong (mm) 80 100 100
Tai trong dong (kN) 104 365 260
Toc do gioi han (rpm) 5,600 2,800 4,500
Ung dung dien hinh Quat FD nho Quat ID lon Quat ID trung binh

Khi chon vong bi, can doi chieu voi bang tai trong dong va tai trong tinh trong catalog cua nha san xuat. He so C/P (tai trong dong / tai trong tuong duong) quyet dinh tuoi tho tinh toan theo ISO 281.

Bao tri va giam sat rung dong

Bao tri dung cach keo dai tuoi tho vong bi gap 2-3 lan so voi van hanh khong bao tri. Ba buoc chinh:

  1. Boi tron dinh ky: Su dung mo goc canxi sulfonat hoac lithium phuc hop. Chu ky boi tron phu thuoc nhiet do van hanh va toc do quay. Quy tac chung: boi tron moi 2,000-4,000 gio voi quat chay lien tuc.
  2. Giam sat rung dong theo ISO 10816-3: Dat cam bien gia toc tai goi do. Nguong canh bao thong thuong la 4.5 mm/s RMS, nguong nguy hiem la 11.2 mm/s RMS cho may nhom III.
  3. Kiem tra nhiet do: Nhiet do goi do on dinh thuong tu 60-80 do C. Tang dot ngot tren 95 do C la dau hieu boi tron khong du hoac hong vong bi.

Viec ket hop giam sat rung dong va nhiet do cho phep chuyen tu bao tri dinh ky sang bao tri du doan (predictive maintenance), giam thoi gian dung may ngoai ke hoach.

Key Takeaways

  • Chon vong bi dua tren tai trong, toc do va dieu kien nhiet do cu the cua quat.
  • Vong bi du tu lua 22320 E phu hop quat ID tai nang; vong bi cau 6316 C3 phu hop quat FD co-trung binh.
  • Boi tron dung loai mo va dung chu ky la yeu to quan trong nhat de keo dai tuoi tho.
  • Giam sat rung dong theo ISO 10816-3 giup phat hien som cac hu hong tiem an.
  • Nhiet do goi do vuot 95 do C la tin hieu can hanh dong ngay.