Blow-By Gas Separator Heating Through Head Cover Conduction
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Solution Overview
Problem
Existing blow-by gas recirculating devices in diesel engines face issues with moisture freezing in the speed-increasing mechanism, leading to increased internal pressure and potential seal failure due to the formation of ice.
Innovation Solution
A temperature raising mechanism is introduced, where a heating means is fixed to the outer surface of the head cover, using a semiconductor ceramic heater with barium titanate, which generates heat conducted via a heat conducting portion to the separating portion, preventing moisture freezing and oil carbonization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a speed-increasing mechanism is used in the blow-by gas treatment device to separate oil from gas, then the separation efficiency is improved, but moisture in the oil may freeze at low temperatures causing internal pressure rise and potential seal failure
Solution Approach 1:
The heating element is installed in advance on the head cover to preemptively prevent moisture freezing before it occurs during cold operation. The heater prepares the environment by maintaining temperatures above freezing point in the blow-by gas treatment device, ensuring reliable operation from startup.
Solution Approach 2:
The head cover serves as a thermal intermediary between the heating element and the blow-by gas treatment device. The heat conducting portion of the head cover transfers thermal energy from the heater to the partition wall and separating portion, indirectly preventing moisture freezing without direct contact between the heater and the separating components.
2Reliability
If direct heating is applied to the separating portion to prevent moisture freezing, then freezing suppression is improved, but oil carbonization may occur due to excessive temperature
Solution Approach 1:
The heating system provides localized heating only to the regions where moisture freezing is likely to occur (partition wall and surrounding areas), while maintaining moderate temperatures. The heat conducting portion distributes heat selectively to prevent freezing without creating excessive heat that would cause oil carbonization in the separating portion.
Solution Approach 2:
The head cover acts as a thermal buffer and intermediary between the heating element and the separating portion. This indirect heating path through the heat conducting portion moderates temperature transmission, preventing both freezing (by sufficient heat transfer) and carbonization (by avoiding direct high-temperature exposure to the separating portion).
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The mechanism effectively suppresses moisture freezing and oil carbonization in the separating portion, maintaining engine functionality by ensuring the separating portion does not become excessively hot or icy.
Implementation Method 1
The head cover has the heat conducting portion. The heat conducting portion is in contact with the partition wall part and conducts the heat generated by the heating means to the separating portion.
Implementation Method 2
A temperature raising mechanism is introduced, where a heating means is fixed to the outer surface of the head cover, using a semiconductor ceramic heater with barium titanate, which generates heat
Data Source
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AI summary
A temperature raising mechanism for a blow-by gas treatment device which can suppress freezing of moisture contained in blow-by gas at a low temperature and an engine including the temperature raising mechanism for the blow-by gas treatment device are provided. A temperature raising mechanism 800 for a blow-by gas treatment device has a head cover 4 assembled to a cylinder head of an engine, a blow-by gas treatment device 100 which is disposed in the head cover 4 and treats the blow-by gas, and heating means 600 which is fixed to an outer surface 703 of the head cover 4 and generates heat. The blow-by gas treatment device 100 has a partition wall part 200 which is fixed to the head cover 4 and partitions an inside of the head cover 4 into a plurality of regions, and a separating portion 330 which is provided in the partition wall part 200 and separates the blow-by gas into oil and gas. The head cover 4 has a heat conducting portion 700 which is in contact with the partition wall part 200 and conducts the heat generated by the heating means 600 to the separating portion 330.