Detailed introduction
1.Electric heat tracing cable heating material:
Electric heat tracing cable is an advanced intelligent self-regulating electric heat tracing in the world today. Its heating element is a composite conductive polymer, which is a conductive composite formed by adding conductive materials (such as carbon black, graphite, carbon fiber, metal powder, etc.) to a general-purpose polymer. It is a带状 (linear, plate) device formed by extruding a conductive polymer composite with "PTC" effect between two parallel wire cores. The heating element is a PTC material with positive temperature coefficient effect (referred to as PTC material). Through the two wires, a PTC core tape is formed, which is equivalent to an infinite number of self-adjusting parallel resistor circuits. The so-called "PTC" effect refers to the phenomenon that the resistance of the heating material increases with temperature. Therefore, it can automatically adjust the electric heating output power according to temperature changes. When the temperature rises to a certain point, its resistance tends to infinity, meaning the output power is approximately zero, and vice versa. The above phenomenon is called the memory characteristic and switching characteristic of PTC products. (The base material can be selected from fluororesin or polyethylene as the base.) Therefore, its heating material is a composite material formed by adding conductive fillers (such as carbon black) to a composite conductive polymer.
The quality of ZHHG Zhonghai Huaguang self-regulating temperature control mainly refers to the stability of its memory characteristics and switching characteristics (switching point). When the product is at a certain critical high temperature point (maximum withstand temperature), its stability accumulates and decays until it no longer heats. Under certain conditions (i.e., the level of working voltage, the number of power cycles, the internal and external ambient temperature during use, and the long-term working state, i.e., the output power level), the more stringent the conditions, the more stable the "memory" and "switching" characteristics, and the better the quality. Therefore, comparing the quality of ZHHG Zhonghai Huaguang self-regulating temperature control should be done under the same usage conditions or by comparing the stability of similar products under different conditions. The more stringent the conditions it can adapt to, the better its quality.
2.PTC memory performance:
The heating element of ZHHG Zhonghai Huaguang self-regulating temperature control is made of polymer PTC material, and its heat tracing performance is entirely based on the PTC characteristics of the material. To delay and prevent the harmful agglomeration of conductive carbon black, it is best to "fix" the distribution of carbon black particles in the polymer matrix so that the core tape can always "remember" the resistance at different temperatures. That is, the resistance change of the core tape during each cooling process always follows the PTC trajectory of the resistance during the heating process, giving the core tape PTC memory function. Therefore, the product requires radiation crosslinking. This not only improves the heat resistance of the core tape (such as resistance to short-term exposure temperature) but also extends its working life. After crosslinking, ZHHG Zhonghai Huaguang self-regulating temperature control can still maintain excellent PTC working performance after long-term power-on heat tracing or repeated external hot and cold cycles, and can effectively prevent the occurrence of NTC effects.
3.Structure and working principle
The basic type ZHHG Zhonghai Huaguang self-regulating temperature control consists of a PTC core tape and an insulation layer. The PTC material is uniformly and continuously extruded (or wrapped) onto parallel metal wire cores (also called bus bars) to form a flat tape, which is the PTC core tape. After covering with an insulation layer, the basic type cable is made. When one end of the core tape is connected to the power supply, current flows from one bus bar laterally through the parallel PTC material layer to the other bus bar, forming a parallel circuit. A certain length of core tape has a certain resistance at a certain temperature and has PTC characteristics. When current flows through the parallel PTC material layer, Joule heat is generated, causing the core tape to heat up. At the same time, the heat from the core tape is transferred through the cable insulation layer to the lower-temperature heated system to compensate for the heat lost by the system to the environment. When the electric power of the cable equals the heat loss of the system, the system temperature can remain stable, and the cable and system reach a stable working state of heat tracing and insulation (i.e., steady state). Therefore, the PTC material layer is a resistive heating element, and the PTC core tape is the heating element of the heat tracing cable. This long-tape cable (electric heat tracing tape) is an excellent heat tracing and insulation material. In addition to its unique heat tracing function, its long-tape structure facilitates flat laying or winding installation on complex-shaped insulated systems. According to industrial heat tracing needs, a shielding layer and outer sheath can be added to the basic type cable to make different types of ZHHG Zhonghai Huaguang self-regulating temperature control, including explosion-proof, protective, and anti-corrosion types.
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