Heat Gun

Overview

A heat gun is a handheld tool that blows a stream of hot air, used for stripping paint, shrinking heat-shrink tubing, thawing pipes, bending plastic, loosening adhesives and reflow soldering. This model is a 2000 W corded unit with closed- loop temperature control: the operator dials a setpoint between 50 °C and 650 °C on the Display & Keypad, and the tool holds it by modulating heater power against the measured outlet temperature. Two airflow stages trade jet velocity against dwell time for delicate versus aggressive work.

Mains current enters through the Power Cord and is gated by the Trigger Switch & Cool-Down Circuit. The Control Board runs the control loop on its MCU, phase-controlling a triac that feeds the Heating Element Assembly element while a separate driver commutates the Blower Assembly motor. Everything sits inside the glass-filled nylon Housing, whose pistol grip keeps the operator's hand clear of the hot barrel.

How it works

Air is drawn in through a screened inlet at the rear of the handle, past the Air Intake Filter Screen, and pressurised by a centrifugal impeller spun by the brushless fan motor in the Blower Assembly. That airstream is forced forward through the Heating Element Assembly assembly, where it passes over a nichrome coil wound on a slotted mica former. The coil glows; the moving air strips heat off it and carries it out the nozzle. Because the heat is convected away as fast as it is produced, the coil never runs away, airflow and power are balanced.

A K-type thermocouple sits in the outlet stream and reports the real air temperature back to the control board. The MCU compares it to the setpoint and trims heater duty cycle through the triac many times a second, so the displayed temperature tracks the dial regardless of how close the nozzle is held to the work. A one-shot Thermal Fuse in the heater circuit opens permanently if the element ever overheats, for instance if the fan stalls or the inlet is blocked.

When the trigger is released, the cool-down circuit keeps the blower running for a short interval after the heater is cut, purging residual heat from the coil and barrel so the nichrome and the Housing are not cooked by soak-back. The fold-out Support Stand lets the gun sit nozzle-up for hands-free work, and snap-on attachments from the Nozzle & Concentrator Set shape the output into a focused jet, a pipe-wrapping reflector or a wide paint-stripping fan.