At present, the use of insulation in the induction furnace on the surface of the product is more beautiful, smooth finish higher reasons, the actual insulation effect in the induction furnace use of the environment is very weak. The main reason is because the conventional insulating paint high temperature, corrosion resistance of poor performance. The use of induction furnace most of the environment is more harsh, although there are water-cooled system,Induction coil it can not ensure that the insulating paint has been working in a lower temperature environment. For example, due to the local dust caused by the local ignition, the part of the insulating paint is quickly carbonized, carbonated insulation material completely lost insulation effect into a conductor, in turn, to accelerate the ignition and current leakage occurred, resulting in a vicious cycle The In addition, the use of the environment in most cases, there are acid and alkaline corrosion atmosphere, easy to cause corrosion of the insulating paint or eventually fall off.
For the vacuum induction furnace, or the coil needs to be used in high temperature environment, the conventional insulating paint must not be used, and the usual practice is to use the mica banding way (left), the way not only the operation of complex, large amount of labor, And still difficult to guarantee the insulation performance of the coil,Induction coil the right figure is the way the bandaged coil, wrapped in the first use of the mica tape was burned pictures. The reason is because the mica tape is not entirely made of mica, such as its binder at a very low temperature can be burned, resulting in damage to the coil surface.
In view of the above problems listed in the conventional insulating paint or conventional insulation methods, we have introduced THERMAL S.C series of ultra-high temperature insulating paint for induction coil, which can effectively solve the above mentioned problems.
The output coil used in the high frequency welded pipe is the key process of the straight seam welded pipe. High-frequency welding is the use of high-frequency current skin effect and proximity effects, making the end of the steel plate in a very short period of time to melt, after extrusion to the surface of the oxide layer and impurities are extruded, the substrate is integrated The High-frequency current is relative to our normal industrial frequency of 50Hz, it is generally from 50KHz to 450KHz frequency. High frequency welding for induction welding. Induction welding is the use of induction coil to make high-frequency current in the edge of the board gathered, it is very large power loss in the welding, but more stable, welding weld after melting smooth. The distance between the sensor and the steel pipe is 3 --- 5 mm. The multi-turn induction coil is two to four turns, wrapped in a round copper tube into a round drum, which is cooled by water, it can be in a very short time The edges of adjacent steel plates are heated, melted, and abutted by extrusion. Because of its distance from the tube embryo closer to the surface of the iron oxide iron easily attached to the surface of the coil, until the accumulation to a certain amount will produce a discharge phenomenon of the coil breakdown, damage.
First, the common coil production
High-frequency welding output coil with the entire production of copper, each copper pipe length of 1.2 meters to 1.5 meters, the middle part of the bend into a multi-turn coil for use, the coil hit the whole after the fire.
Second, the existing coil production methods
The coil from a whole, into three sections of the production, after the destruction of only part of the replacement. Pre-damaged coil, the bad part of the cut off, the remaining part of the integrity of the classification by specifications, according to the different diameter to calculate the length of the need for copper, the coil production.