国产黄色在线观看高清视频网站|国产免费黑丝袜在线观看|成人无码区免费AV片久久|欧美日韩本地亚洲|欧美特黄一区二区|356香蕉在线亚洲黄色笫一区|日韩下面一级看A级午夜视频|日韩一级片大黄片|人妻91福利日韩黄色一级片|福利视频一区二区

The bellows heat exchanger is based on the traditional tube-and-tube heat exchanger, applying the theory of enhanced heat transfer and the unique design of the peaks and troughs of the heat exchange tube, which makes a major breakthrough in the performance of the heat exchanger.

The corrugated tube is a double-sided enhanced heat transfer tube that is processed by a special process on the basis of an ordinary heat exchange tube and has concave and convex waves inside and outside the tube, which can strengthen the inside and outside of the tube. From the waveform, it is divided into two categories: spiral corrugation and annular corrugation. Because the joints of spiral corrugated pipes are difficult to handle and their use is limited, ring corrugated pipes are now widely used. Ring bellows are divided into trough-shaped bellows, trapezoidal bellows, zoom tubes, and corrugated tubes.