It consists of two parts: the heater body and the control cabinet.
1.1The electric heater body is composed of multiple tubular heating elements, a shell, a protective cover, a base, and other components. The heating element is a tubular electric heating element made of high-temperature resistance alloy wire, with a stainless steel tube as the protective sleeve and crystalline magnesium oxide as the filler, formed through a compression process. It has the characteristics of good mechanical strength, high thermal efficiency, wear resistance, and corrosion resistance. A flow guide baffle is installed inside the shell to ensure uniform heating during air circulation.
1.2The working principle of the control cabinet is to use an intelligent digital display temperature controller, high-power thyristor, and thermal resistance to form a measurement, regulation, and control loop. The thermal resistance converts the outlet temperature of the heater into a milliampere signal, which is sent to the intelligent digital display temperature controller for amplification and comparison, and then the corresponding temperature value is displayed. When the displayed value is higher than the set value, the thyristor does not conduct. When the displayed value is lower than the set value, the intelligent digital display temperature controller triggers the thyristor to conduct. When the displayed value is close to the set value (i.e., near the set value), the intelligent digital display temperature controller changes according to the P, I, D law, so that the control cabinet has good control accuracy and regulation performance. The intelligent digital display temperature controller automatically changes the number of trigger pulses of the thyristor based on the milliampere signal from the thermal resistance, that is, it controls the conduction angle of the thyristor per unit time, adjusts the voltage, and controls the heating power of the heating element, ensuring energy saving and constant temperature, avoiding current surges, and extending service life. When the equipment is suddenly shut down and then restarted, the control cabinet can automatically adjust smoothly.
1.3When the heating elements are set in groups, the control cabinet can also adopt group control. The control part consists of digital circuits, trigger circuits, and other components. It automatically engages at low temperatures, alarms at high temperatures, and automatically cuts off power to achieve uniform temperature control.
