Spiral finned tube

Spiral finned tube

Spiral fin tube is an efficient heat transfer element with spiral fins. Its heat transfer area is several to dozens of times that of a light tube, which can enhance heat transfer, reduce flow resistance, and reduce metal consumption, thereby improving the economy and operational reliability of heat exchange equipment. Spiral finned tubes have been widely used in various boilers. Spiral finned tubes can be manufactured using a variety of methods. The finned tubes used in heat exchange equipment such as boilers and pressure vessels mainly include the following manufacturing methods: high-frequency resistance welding spiral finned tubes, brazed spiral finned tubes and Integral spiral fin tube. Detailed introduction to the manufacturing methods, performance evaluation indicators, applications of spiral fin tubes and the advantages of integral spiral fin tubes, etc.

Advantages of using finned tubes:
1) The heat exchange area is increased in the effective space to improve the heat transfer effect.
2) Reduce the space occupied by the heat transfer surface and reduce its volume, especially suitable for quick-installation boilers.
3) Reduce equipment costs and improve equipment safety.
4) The operating cost is reduced due to the reduction of water side pressure drop.
5) The stiffness of the finned tube is increased, which improves the seismic resistance of the tube.

Manufacturing method
Spiral finned tubes can be manufactured by a variety of methods. The finned tubes used in heat exchange equipment such as boilers and pressure vessels mainly include the following manufacturing methods:

High frequency resistance welding spiral fin tube
High-frequency resistance welding of spiral finned tubes introduces high-power high-frequency current into the parts to be welded, and uses the resistance heat generated by the current through the contact surface and adjacent areas of the joints of the parts to be welded to make the welding contact surface achieve molten or semi-melted plasticity. state, and then apply appropriate pressure to the welding contact surface to complete the welding of the finned tube.

Brazed spiral fin tube
Brazing spiral finned tube is to fill the space between the parts to be welded with a filler metal with a lower melting point than the welding parts, and then heat it to the brazing temperature. When the welding parts do not melt, the filler metal melts and wets the brazing well. However, the brazing joint is formed by diffusion at the contact point of the welded parts, thereby completing the welding of the spiral fin tube.

Integral spiral fin tube
Integral spiral finned tube is an integral spiral finned tube that is formed at one time by extruding and rolling thick-walled tubes (blank tubes) under medium-frequency continuous heating. It is the latest method of manufacturing finned tubes. A domestic company has already applied for patents for the integral spiral fins and self-made integral fin tube manufacturing equipment.