Single U-type and double U-type heating elements are common structural types of electric heating tubes, primarily differing in heating zone length and power design. Both utilize a stainless steel sheath, nickel-chromium heating wire, and magnesium oxide filling structure, offering corrosion resistance and high thermal efficiency.
Structural Features
Single U-type: Composed of a straight tube section and a single U-shaped bend, with the heating zone concentrated in the straight tube and the inner side of the U-bend, featuring a relatively simple structure.
Double U-type: Adds a longitudinal horizontal bend to the original U-shape, forming a double-layer U-type structure that effectively extends the heating zone length, enhancing power output and heating speed.
Application Scenarios
Single U-type: Suitable for fluid heating, mold temperature control, etc., with improved installation flexibility through optimized clamping mechanisms and multi-layer protective structures.
Double U-type: Commonly used in industrial equipment requiring faster heating efficiency, such as melting low-melting-point alloys or heating air/liquid media.
Materials and Performance
Both types employ a stainless steel sheath, nickel-chromium heating wire, and magnesium oxide filling structure. However, due to its complex structure, the double U-type requires attention to sealing and mechanical stress protection during installation.