| 摘要 |
The purpose of the present invention is to provide a heater with a sag preventing structure of a heating coil. The present invention includes: a tube (10) which includes a space for receiving a heating coil (30); a bobbin (20) which includes a coil receiving groove (24) on the outer circumference thereof and is embedded in the tube; and the heating coil (30) which is formed on the outer circumference of the bobbin (20) and is connected to a power supply line (14). A spiral protrusion (22) is formed on the outer circumference of the bobbin (20). The coil receiving groove (24) is spirally extended on the outer circumference of the bobbin (20) by the spiral protrusion (22). The heating coil (30) is received and combined with the spiral coil receiving groove (24). |
