When the crankcase ventilation is immersed in the idea of making plans, there is always a part of combustible gas and exhaust gas that rush into the crankcase through the piston ring. After the gasoline vapor that rushes into the crankcase will condense, the engine oil will become thinner and the function will become deteriorated. The waste gas contains water vapor and sulfur dioxide. The water vapor condenses in the engine oil to form foam, which damages the supply of engine oil. This phenomenon is particularly serious in winter; sulfur dioxide meets water to form sulfuric acid, and sulfuric acid touches oxygen in the air to form sulfuric acid. The appearance of these acidic substances not only deteriorates the engine oil, but also causes the parts to be eroded. Because combustible and muddy gas and exhaust gas flow into the crankcase, the pressure in the crankcase will increase, and the engine oil will seep out of the crankshaft oil seal, crankcase liner, etc. and disappear. The oil vapor that is missing into the large air will add to the pollution of the large air. The above phenomena can be prohibited or alleviated by the installation of crankcase ventilation and assembly. Therefore, the immersion of crankcase ventilation and assembly is: 1. Beware of engine oil deterioration: 2. Beware of crankshaft oil seal and crankcase liner leakage; 3. Beware of various oil vapor pollution.
2. The form and characteristics of crankcase ventilation 1. Natural ventilation gas extracted from the crankcase can be directly introduced into the large air. This ventilation method is called natural ventilation. This ventilation system has a very powerful structure and is easy to operate, but the combustible and muddy gas and oil vapor introduced into the air can easily pollute the air. Therefore, there are not many ideas in this life. According to the imported air, there are popular and respirator types. (1) The oil vapor in the popular crankcase is directly similar to the large air through the fuel refueling port of the engine oil pipe. This ventilation system does not require special machinery, and various oil vapors are directly discharged into the large air, which pollutes the large air. Therefore, it is suitable for internal combustion engines on some rural fatigue machines that are not highly demanding. (2) The oil vapor in the respirator crankcase is similar to the air through a respirator assembly. This respirator assembly is a filter assembly that adsorbs harmful gases and prevents large gases from being contaminated. Figure 1 shows the respirator assembly of the Iveco light passenger car jointly produced by Nanjing Yuejin Co., Ltd. and Italy. The bolts for the respirator are stabilized on one side of the cylinder block, and there is an air inlet on the bottom side similar to the crankcase, and two rubber tubes on the upper air outlet are similar to the air. There are two filter mesh filled with plating steel wire inside the respirator to disperse the oil mist and be friendly. When making a plan, various gases entering the crankcase pass through the air inlet of the respirator; when entering the respirator, filtering and dissipating through the filter, the clean air at the end is overhead through the air outlet through the rubber tube. Because there are two layers of filters, the oil mist is less overhead, which not only ensures the pressure balance in the crankcase, but also prevents the oil and gas in the crankcase from polluting the large air. 2. Forced ventilation control policy: The air intake system is used to absorb and dye the gas in the crankcase. This ventilation method is called forced ventilation. This ventilation system is a bit huge, but it can control the combustible and turbulent gas and exhaust gases that penetrate into the crankcase. This is not only conducive to the economics of forward-looking policy, but also reduces the emission pollution of the policy, which is widely used in the current automotive policy. Forced ventilation according to the form of suctioning gas in the crankcase includes the same normal type, one-way valve type, oil and gas dispersion type and comprehensive type. (1) The same normal type is just a ventilation system where the crankcase and the intake pipe are connected with a rubber pipe, which is the same normal type forced ventilation. This ventilation system structure is very powerful, only the pipeline is connected, and the center does not require other components to be connected, and it is suitable for some small-scale ideas. The gasoline engine crankcase is a regular forced ventilation assembly. The upper part of the air filter is equipped with an air inlet hose for opening into the valve chamber cover. There is an outlet pipe on the tappet chamber cover to the inlet of the carburetor. When making a plan, the gas in the crankcase is sucked into the carburetor through the air outlet pipe, and the strange air filtered by the air filter is filled into the crankcase through the intake hose and valve chamber cover. (2) A check valve type connects a check valve in the pipeline connecting the crankcase and the intake pipe to prevent the oil in the crankcase from being sucked out. It is suitable for automotive gasoline engines, such as EQ6100Q, Japanese Mitsubishi Pajero (cheetah) Automotive Sense. Gasoline engine one-way valve crankcase forced ventilation assembly. The valve chamber cover is equipped with a small air filter, connected between the crankcase and the intake pipe by an outlet pipe, and a one-way valve is installed at the connection position before entering the intake pipe. When making a plan, the steam in the crankcase is sucked into the cylinder through the air outlet pipe and the check valve, and the strange air enters the crankcase through the small air filter on the valve chamber cover. The impregnation of the check valve is to prevent the vacuum of the intake pipe at low speed and low loads, so that the engine oil can be sucked out of the crankcase. The crankcase ventilation check valve is mainly composed of a valve, valve body, valve seat and spring. When the idea is idle, the vacuum in the intake pipe is large, the check valve is sucked on the valve seat, and the exhaust gas in the crankcase enters the intake pipe through the small hole in the valve; as the idea load increases, the vacuum in the intake pipe decreases, and the valve is pushed outward under the immersion of the spring force, and the ventilation volume gradually increases; when the idea is large, the valve is completely opened and the ventilation volume is large, which can update the immersion of the air in the crankcase. (3) The oil and gas disperser type connects an oil and gas disperser in the pipeline connecting the crankcase and the intake pipe, dispersing the oil and gas extracted from the crankcase, causing the liquid oil to flow back to the crankcase and the gaseous gas to be sucked into the intake pipe, thereby eliminating the consumption of engine oil. Steyrze Idea's oil and gas dissipator, which is placed at the front end of the cylinder head of the Idea's cylinder head. When making a plan, the oil and gas processing path into the crankcase enters the oil and gas disperser. Because the plane under the volume of the oil and gas disperser is inclined, the liquid oil flows back to the crankcase along the inclined surface and return pipe, and the gaseous gas enters the intake duct through the joint. (4) The integrated type not only connects a check valve in the pipeline connecting the crankcase and the intake pipe, but also connects an oil and gas disperser, which eliminates the consumption of engine oil and ensures the stability of engine oil lubrication under various working conditions. The crankcase integrated forced ventilation assembly of the gasoline engine. A crankcase ventilation air inlet filter is placed on the front cover of the cylinder head, and a crankcase ventilation air outlet filter is placed on the rear cover of the cylinder head. The filter is filled with oil and gas dissipation, which is also called an oil and gas dissipation device. There is a filter element inside the oil and gas disperser, and a partition at the upper end of the filter element makes it have good oil and gas dispersing effect; a check-way valve is located on the top of the oil and gas disperser, which relieves the high temperature situation from affecting the valve bonding and blockage. When making thoughts, the combustible and muddy gas leaking into the crankcase and the exhaust gas leaked into the air inlet pipe are immersed in the vacuum degree, and enter the air inlet pipe through the lifter chamber, oil barrier plate, crankcase ventilation outlet filter, ventilation hose and one-way valve. The air inlet pipe is mixed with the strange muddy gas, and enters the cylinder and burns and disappears. The strange gas enters the crankcase through the air filter for ventilation inlet on the front cover of the cylinder head.
3. Search and repair of crankcase ventilation 1. Search and inspect pipeline situation (1) Remove the air outlet hose and return hose assembled by crankcase ventilation, and remove the relevant components (respirator, or check valve, or oil and gas dissipator). (2) Check whether the pipeline is flattened, damaged, or leaked, then clean it and blow it with compressed air. (3) Replace in the reverse order when disassembly. 2. Search for checking the case of checking the case of checking for checking the check valve. When installing a forced crankcase with a check-in, focus on checking the check-in. If the check valve is stuck and open or blocked, it cannot ensure normal ventilation of the crankcase. When the valve is stuck and blocked, the load of the ventilated load is insufficient, and the oil and gas in the box will penetrate into the ventilated air, which will be polluted. When the valve is always open, the oil consumption of the ventilated will be over. (1) In the vacuum situation of the search valve, unscrew the check valve, then connect the ventilation hose, and idle the idea to turn the check valve, place your finger on the tip of the check valve. At this time, the finger should feel vacuum. If you raise your finger, there should be a 'bang, bang' suction sound at the valve. If the fingers do not feel vacuum or sound, use the cleaning solution to clean the check valve and ventilation hose and then search. If it still fails, please adjust it. (2) When searching for the valve, unscrew the check valve and insert the check valve with a thin wooden rod. At this time, the valve plunger should act freely from front to back. If the valve plunger does not move, it should be cleaned or adjusted.
More than 20 years of experience in gas power generation engineering application. It has the ability to provide integrated operation services of technology, equipment, engineering design, construction, operation and services.
