The fin tube adds fins to the surface of the tube, and the original surface is expanded to form a unique heat transfer element.
As the two media inside and outside the tube is convection heat transfer, the heat transfer coefficient of the water in the tube is the air outside the tube heat transfer coefficient of the dozens of times a hundred times, so the installation of fins in the outside of the tube, the air side of the heat exchange area of the original extend greatly, make up the air outside the tube for thermal characteristics low coefficient.
Single metal fin tube
The fin tube with the same material as the base tube and the fin is called the single metal fin tube.
The single metal fin tube is winding type, and its fin is inverted Y type. The base pipe is fixed on a 360 degree rotating transmission winding device, and then according to the different chip height and chip spacing, choose different types of clamps. The fin is strip shaped, and the fin is formed by mechanical tension once it passes through the jig.
Characteristics of single metal fin tube:
The distance between 1. pieces is large, and the thickness is 0.2-0.5mm in 3.2-8mm. The unit heat exchange area is small, and the contact thermal resistance is relatively large.
2. because the single metal fin tube is standing on the base pipe with the bottom wrinkle evenly, the bottom wrinkle can disturb the air outside the pipe, which is beneficial to the heat transfer enhancement. At the same time, the bottom wrinkles also increase the gas side resistance, and easy to produce dust accumulation in the wrinkles, etc., for the removal of condensate and dust cleaning to increase the difficulty, must pay attention to the selection.
3. the single metal fin tube also has the advantages of convenient material sampling, low processing difficulty and light manufacturing cost. The fin of the single metal fin tube is not completely covered with the base tube, and the base pipe is exposed to the air and is easy to corrode.
Aluminium rolled fin tube and bimetal composite fin tube
Aluminum rolled fin tube is rolled integrally by aluminum tube, without contact thermal resistance, high strength, heat resistance and mechanical vibration, good thermal expansion performance, and has considerable expansion heat exchange surface. The heat exchanger controlled by this fin is a kind of heat exchanger with a wide range of uses.
Double metal composite fin tube is copper, aluminum (aluminum or steel pipe, stainless steel pipe, aluminum pipe; or) by compound after rolling fin has the advantages of tight combination, small heat resistance, good heat transfer performance, high strength, small flow loss, corrosion resistance is strong, in the long hot and cold condition, deformation, work late long service life etc..
The whole rolling fin without burr, no fold, after cleaning, heating and air conditioning engineering in the wet cooling fin surface easy to remove condensed water in dry heating and other heat exchange occasions is not easy to dirt and scale formation.
The aluminum rolled fin tube and bimetal composite fin tube produced by our company are treated by polarization, and the color is beautiful and easy to handle, and the surface corrosion can be avoided.
Fin tube with fins
The round fin tube refers to the fin tube formed by cold coiling at normal temperature. Its processing technology is simple and the material is convenient. It is winding the high quality steel strip or aluminum belt directly on the steel pipe by mechanical force;
According to the material quality, the round fin tube is divided into steel tube around steel plate, steel tube around aluminum piece, steel pipe around copper strip and so on;
Around the finned tube finned aluminum material, the fins are L type or LL type name for the L type finned tube and double L type finned tube, it can be processed into smaller distance, the minimum distance is 2.3mm, the unit heat transfer area is larger than the price, around the steel sheet is slightly higher than the double. Metal composite fin tube is cheaper. Effect of heat transfer in the relationship between the two disadvantage is that aluminum insufficient rigidity, not applicable in the larger work environment of expansion and contraction, and with the increasing period, the influence of thermal contact resistance is more obvious, usually used for system more stable working environment, such as hot water for heating or cooling, steam and heat conducting oil as heating where the media should be used with caution.
The coiled finned tube is widely used at present, and can be processed into carbon steel sheets around the stainless steel sheet. The spiral finned tubes, which are spirally twisted around the fins, can be called the fin tubes with fins, which are qualitative in the processing technology.
High frequency welded fin tube
The high frequency welded fin tube is used to heat the steel strip and the outer surface of the steel tube by heating the skin effect and the proximity effect of the high frequency current until the plastic state or melting is finished, and the welding is completed under the certain pressure of the winding steel strip. This kind of high frequency welding is a solid phase welding. With the mosaic, brazing (or whole Galvanized) method compared, both in product quality (fin welding rate is high, up to 95%), or the productivity and automation degree, are more advanced. The high frequency current and side winding welding are adopted, so the base pipe and fin are basically integrated, and the welding rate is an important index to judge the quality of fin tube.
High frequency welded fin tube is suitable for high temperature and high pressure occasions. The base pipe is made of stainless steel or ND steel. At the cooling temperature above dew point, there is no working environment for condensation liquid, and ordinary carbon steel can be used as base pipe
The thickness of high frequency welded fin segment is usually more than 0.8, and the fin height is smaller than the radius of the base tube. If the high fin must be made, the fin can be made into an open tooth fin. Now widely used in electric power, metallurgy, cement industry preheating, recycling and petrochemical industries
Fin tube
The finned tube is a tube is high-quality copper, through the special winding machine, the quality of copper close evenly wound on the external surface of the base tube, and then the whole tin. Copper fin tube with round copper plate, working temperature: -10 C -+160 C.
The finned tube is industrial refrigeration radiator, the most commonly used air cooler fin tube.
Stainless steel fin tube
The stainless steel tube is used as the base pipe, and the fin tube made of additional fins is called the stainless steel fin tube. It is the most important heat exchanger element of the fin tube heat exchanger.
The stainless steel fin tube has stainless steel fin tube around stainless steel sheet, L fin tube around aluminum fin and rolled composite steel aluminum fin tube, and stainless steel tube welded stainless steel sheet;
Stainless steel fin tube has higher fin ratio, and it is the most important heat transfer element of fin tube heat exchanger.
Steel spiral fin tube with winding piece
Overview of steel spiral fin tube:
Steel sheet winding spiral finned tube is the direct winding process, namely in a high-quality seamless steel pipe, through the special winding machine, the high-quality steel by mechanical force closely and evenly wound on the external surface of the base tube, both ends of a fixed spot; then the steel around the whole hot galvanized fin tubes processing.
Two 、 steel spiral fin tube with winding pieceCharacteristic:
1. The fins are tightly wrapped on the outer surface of the base pipe. The thermal contact resistance is small and the heat transfer performance is high.
2, durable: in the outskirts of the environment, the standard hot-dip galvanized rust thickness can be maintained for more than 50 years without repair; in the urban or offshore areas, the standard hot-dip galvanized rust prevention layer can be maintained for 20 years without repair;
3, good reliability: galvanized layer and steel is metallurgical bonding, become a part of the steel surface, so the durability of plating is more reliable;
4, the toughness of the coating is strong: galvanized layer forming a special metallurgical structure, this structure can withstand mechanical damage in transportation and use;
5, comprehensive protection: each part of the plating parts can be plated with zinc, even in the depression, sharp corners and hidden places can be fully protected;
The copper fin tube
The copper fin tube by copper and rolled into the whole, without thermal contact resistance, high strength, heat resistance and mechanical vibration, thermal expansion performance, and has considerable extended heat transfer surface. The heat exchanger controlled by this fin is a heat exchanger with a wide range of uses and the highest heat transfer efficiency