Single-head electric heating tubes are also called single-head heating tubes and single-head heating tubes. Single-head electric heating tubes have the characteristics of simple structure, high thermal efficiency, safety and reliability, easy installation, and long service life. So it has been widely used in life. Although the structure of the single-head electric heating tube is relatively simple and the thermal efficiency is high, the heating of the electric heating tube will be uneven in long-term use. Below, we will analyze several major factors that cause uneven heating of single-head electric heating tubes.
The reasons for the uneven heating of the single-head electric heating tube are roughly as follows:
1. The hardness of the resistance wire of the single-head electric heating tube is uneven
Due to the uneven hardness of the resistance wire material, the spiral pitch of the wound heating wire is uneven after being stretched. This situation generally occurs when the drawn heating wire adopts a well-type return process. When winding the spiral heating wire, the uneven tension can also affect the unevenness of the spiral pitch.
2. Improper design of single-head electric heating tube resistance wire
Generally, the heating wire in the heating tube is designed in a spiral shape, that is, a spring shape. If the ratio of the diameter D of the winding core rod to the diameter d of the heating wire is D/d>8, the sagging phenomenon will occur when powder is added.
3. Improper process operation of single-head electric heating tube
When adding powder, the lead rod is exposed and does not meet the requirements. When it is too short, vibrate and add powder while tapping the tube to stretch the heating wire lead rod, or when it is too long, press the lead rod while vibrating and adding powder while tapping the tube. Doing so will cause the heating wire to be too thin or too dense locally, or even short circuit between the heating wire coil and the coil. Improper operation of the shrinking tube process will also affect the uniformity of the heating wire distribution.
4. The single-head electric heating tube powder adding equipment is defective
For example, the amplitude of the scoring equipment is unstable, the lifting speed of the guide rod is uneven, and the powder leakage speed is fast or slow, and so on. Even if the various parameters are normal, the magnesium oxide powder is thinner and denser.
