| 摘要 |
PURPOSE: A pressure balance-type expansion joint is provided to prevent non-uniform deformation and damage of first and second and third bellows units because displacement caused by the extension force of a hot blast pipe is uniformly actuated on each portion of first and second sleeves. CONSTITUTION: A pressure balance-type expansion joint(10) comprises first and second sleeves(20,30) and first and second and third bellows units(40,50,60). The first and second sleeves respectively comprises first and second projected portions(21) and first and second guide grooves(22). The first projected portions are formed at a predetermined distance to a circumferential direction. The first guide groove is formed in between the first projected portions. The second projected portions are inserted into the first guide groove between the first projected portions to the circumferential direction. The second guide groove is formed between the second projected portions and the first projected portions are inserted into the second guide groove. |
