Description
Core Effect
Antifreeze and preheating
In cold environments or when the generator is shut down for backup, maintain the engine cooling water or oil temperature within a suitable range (usually 40-50 ℃) to prevent icing and reduce starting resistance.
Emergency support
For ship emergency generators, it is necessary to ensure that they automatically start within a very short period of time after the main power supply loses power, and the preheating pipe is a key equipment to maintain their "hot standby" state.
Principle and Structure
Principle: Heat is generated by passing current through a high resistance alloy heating wire, which is then transferred to the coolant or engine oil through a metal sheath and a thermal conductive medium (magnesium oxide powder).
Structure: The core consists of a metal protective sleeve (stainless steel/copper), an internal electric heating wire, and a filled insulating thermal conductive medium. There are sealed structures and wiring terminals at both ends to prevent liquid infiltration.
Main Types
Water jacket heating tube: installed in the engine cylinder water jacket to heat the coolant. This is the most commonly used type, which can evenly heat the entire body.
Oil heating tube: installed on the oil pan or oil filter seat, directly heats lubricating oil, reduces viscosity, and improves starting lubrication.
Faults and Maintenance
Burnout: manifested as an infinite resistance (open circuit), usually caused by dry burning (running without water) or high voltage.
Breakdown leakage: Insulation aging or sheath corrosion perforation can cause the heating wire to come into contact with water, leading to leakage protection tripping.
Maintenance: Regularly check the tightness of wiring, measure cold resistance and insulation resistance, and clean surface scale.
