Internal structure principle of finned tube
Pure copper finned tube aluminum and aluminum alloy not only meet these requirements, but also have the characteristics of ductility and tensile strength as temperature decreases, so in compact heat exchangers around the world, especially at low temperatures. Among the heat exchangers, finned tubes have been the most widely used.
The finned tube machine is also called "finned tube rolling mill". It is a copper tube or steel pipe (also known as a base pipe) lined with aluminum pipes of different specifications. It is rolled and composited by the cutters in the unit, and the ribs are extruded at one time. The purpose is to achieve the effect of increasing the heat exchange area. The finning process is to pre-process a batch of individual fins by punching, and then manually or mechanically, according to a certain height (wing distance), the fins are placed on the outer surface of the tube by interference. It is the earliest method of processing finned tubes. Due to the simple process and low technical requirements, the equipment used is inexpensive and easy to maintain, so many factories are still in use. This process is a labor-intensive process solution that is suitable for the capital and technical conditions of a typical small or township enterprise. The manual method is called a manual suit. It uses tools to rely on human strength to push the fins one by one.
It is mainly used to transport high temperature and high pressure fluid pipelines on fertilizer equipment. Representative materials are 20, 16Mn, 12CrMo, 12Cr2Mo and the like. GB9948-1988 (seamless finned tube for petroleum cracking). Mainly used in boilers, heat exchangers and pipelines for conveying fluids in petroleum smelters. The representative materials are 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb and the like. GB18248-2000 (seamless finned tube for gas cylinders). Mainly used to make various gas and hydraulic cylinders. The representative materials are 37Mn, 34Mn2V, 35CrMo, and the like. GB/T17396-1998 (hot rolled seamless finned tube for hydraulic props).