1D-Glow plug PH22 model unpacking
2 year ago
1D auto parts
2 year
Product details
What is the relationship between the Glow plug and the piston? How do they collaborate with each other?
In the core operation of a diesel engine, although the Glow plug and the piston belong to different systems, they are closely related through the combustion process. The synergy efficiency of the two directly affects the starting performance, power output and service life of the engine. Their interaction mechanism can be analyzed from the following dimensions:
1. Combustion optimization: The Glow plug creates an ideal working environment for the piston
① Temperature synergy enhances combustion efficiency
The Glow plug heats the intake air (up to 800-1000℃), making it easier for diesel to evaporate and mix during the piston compression stroke. When the piston moves upward to the end of compression, the autoignition point of the high-temperature mixture decreases, the combustion rate increases, and the explosive force borne by the top of the piston becomes more uniform.
② Reduce carbon deposits and wear
When combustion is incomplete, unburned diesel and carbon particles tend to adhere to the top of the piston and the ring grooves, causing the piston rings to get stuck and the sealing performance to decline. The Glow plug promotes the uniform combustion of the mixture, making the temperature distribution on the piston surface more reasonable (temperature difference ≤50℃), reducing the formation of carbon deposits by 30%-40%, thereby extending the cleaning cycle of the piston assembly, lowering the air leakage rate in the cylinder and the consumption of engine oil.
2. Cold start collaboration: Reduce the risk of low-temperature wear on the piston
When starting in an environment below -20 ℃, the gap between the piston and the cylinder wall shrinks due to low temperature, and the viscosity of the lubricating oil is high. Insufficient initial lubrication is prone to cause "cold welding" wear. The key function of the Glow plug lies in:
● Shorten cold-state operation time: Rapid heating enables the engine to reach a stable idle state within 30 seconds. Compared with the 1-2 minutes without preheating, the operation time of the piston under low-temperature and high-wear conditions is reduced by more than 60%.
● Optimize lubrication conditions: The preheated high-temperature environment accelerates the temperature rise of the engine oil. When the piston starts to reciprocate, the oil film thickness can be increased by 25%, and the friction coefficient can be reduced by 18%. Especially in the first piston ring area, the wear can be reduced by 40%.
3. Structural adaptation: The mutual influence between combustion chamber design and Glow plug layout
① The shape of the piston top matches the preheating effect
The design of piston top combustion chambers such as ω type and shallow basin type needs to be coordinated with the heat radiation Angle of the preheating plug. For instance, if the Glow plug is biased towards the combustion chamber side, the deflector groove at the top of the piston needs to guide the hot air towards the fuel injection area to prevent local overheating (such as the edge temperature of the piston not exceeding 350℃ to prevent premature combustion).
② Balance between compression ratio and preheating power
High compression ratio (such as 18:1) pistons can naturally heat up to over 500℃ at the end of compression. At this point, the Glow plug only needs to be replenishing 300-400℃ to reach the self-ignition point of diesel (about 800℃), which can reduce the preheating power by 20%-30%. Conversely, low compression ratio pistons rely on Glow plugs to provide more heat. It is necessary to avoid abnormal detonation pressure on the piston due to insufficient preheating (exceeding the design value by 10% May cause piston cracks).
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1D auto parts
Audited supplier
2 year
Main Product:
Engine piston,
cylinder liner,
spark plug,
Ignition coils,
head gasket ,
Engine Valve
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