Moreover, the obturating ring can reliably seal the cylinder and the end cover.

且密封圈能将筒体和端盖可靠的密封。

A heat insulating mattress is arranged between the bottom part of the heating plate and the shell, and the through part of the heating plate and the shell is provided with an obturating ring.

所述发热盘底部与壳体间设有隔热垫，所述发热盘与壳体的穿接部设有密封圈。