Set fin tube
The finning process is to process a batch of individual fins in advance by punching machine, and then set the fins on the outer surface of the pipe by manual or mechanical method according to a certain distance height (fin pitch) by interference. It is one of the earliest methods used to process finned tubes.
Mosaic spiral fin tube
The embedded spiral finned tube is a spiral groove of a certain width and depth pre-machined on the steel pipe, and then the steel strip is embedded on the steel pipe on the lathe. During the winding process, due to a certain preload, the steel belt will be tightly tightened in the spiral groove, so as to ensure that there is a certain contact area between the steel belt and the steel pipe. In order to prevent the steel strip from bouncing off, the two ends of the steel strip should be welded to the steel pipe. In order to facilitate the setting, there should be a certain side gap between the steel belt and the spiral groove. If the side gap is too small and interference is formed, the Mosaic process is difficult to proceed smoothly. In addition, the wound steel strip always has a certain rebound, the result makes the steel strip and the bottom of the spiral groove can not be well engaged. The Mosaic fin can be carried out on the general equipment, the cost is not high, but the process is complex and the production efficiency is low.
Brazed spiral fin tube
The brazed spiral finned tube is processed in two steps. First, the steel strip plane perpendicular to the axis of the pipe is wound on the outer surface of the pipe in a spiral way, and the two ends of the steel strip are welded on the steel pipe to fix, and then in order to eliminate the gap between the steel strip and the steel pipe contact, the steel strip and the steel pipe are welded together by brazing method.
High frequency welding spiral fin tube
High frequency spiral fin tube is one of the most widely used spiral fin tube, and is widely used in power, metallurgy, cement industry waste heat recovery and petrochemical industry. The high frequency welding spiral finned tube is to heat the outer surface of the steel strip and steel pipe until the plastic state or melting by using the skin effect and proximity effect of high frequency current while the steel strip is winding the steel pipe, and weld under a certain pressure of the winding steel strip. This high frequency welding is actually a solid phase welding. It is more advanced than inlaying, brazing (or overall hot dip galvanizing) methods, both in terms of product quality (fin welding rate is high, up to 95%), and productivity and automation.
Three high skew rolled integral spiral finned tube
The production principle of the three-roll diagonal rolling integral spiral finned tube is as follows: a core bar is lined in the smooth tube, and the seamless steel tube is driven by the rotation of the roll blade through the hole cavity composed of the rolling groove and the core head. The finned tube produced by this method has high heat transfer efficiency because the base tube and the outer fin are an organic whole, so there is no problem of contact thermal resistance loss. Compared with the welding method, this production line has the advantages of high production efficiency, low consumption of raw materials and high heat transfer rate of finned tubes.
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