Oil smell (waste smell): the valve seat cushion leaks due to aging, the crankcase exhaust pipe leaks badly, the air conditioning filter element is dirty, and the throttle valve is dirty.
Gasoline smell: the carbon canister and solenoid valve are broken, and the top of the fuel tank leaks oil.
Waste odor: the exhaust pipe is rusted and perforated.
Coolant smell (leaking floor mat): the heating box is broken, or the sealing ring is aging and leaking.
Waste gas valve is also called oil separator and pressure control valve. Installed between the compressor outlet and the condenser inlet to improve the heat transfer effect of the condenser and evaporator through isolation.
Oil separator is more important for systems with poor mutual solubility between lubricating oil and working fluid.
Working principle of waste gas valve: high-pressure gas (gaseous working medium and lubricating oil) from compressor enters the waste gas valve, enters the guide vane of the waste gas valve and flows spirally along the guide vane. Lubricating oil is separated from the working medium gas by centrifugal force and gravity, and remains along the inner wall of the cylinder.
The working gas is led out of the waste gas valve from the central pipe through the multi-air baffle. The separated lubricating oil is concentrated in the lower part of the oil separator, which can be discharged regularly or automatically returned to the crankcase of the compressor by using the ball valve.
When the reciprocating engine is running, because the piston ring is not completely airtight, a small amount of working gas enters the engine crankcase from the gaps between the cylinder wall and the piston ring and between the piston ring and the piston. In order to prevent diesel engine blowby from being directly discharged into the atmosphere, closed forced ventilation system must be considered in the process of diesel engine emission upgrading and development.
Close system, that is, forced ventilation of crankcase, is used to solve the problem of crankcase exhaust, that is, bypass gas containing impurities is introduced into the connecting pipe between the air filter of the engine and the intake pipe of the supercharger. There is still a problem with this measure: after the crankcase is forced to ventilate, the system sends the engine blow-by gas back to the intake pipe and enters the cylinder to burn with the fresh gas mixture.
Because the blow-by gas contains a lot of oil droplets, the engine oil can not be completely burned, which has a negative impact on emissions. In addition, the oil can not be effectively separated and flows back to the oil pan from the oil return pipe, which also causes the loss of oil.