[Air-cooled diesel engine]The difference between air-cooled diesel engine and water-cooled diesel engine Is the air-cooled diesel engine durable?
The difference between air-cooled diesel engine and water-cooled diesel engine
1. Compared with water-cooled diesel engine, air-cooled diesel engine has The heat transfer method is different. The water cooler indirectly transfers heat to the atmosphere through the cooling medium water through the radiator; the air cooler is directly cooled by air.
2. The air-cooled diesel engine is simple in structure, small in size and light in weight. Compared with the water-cooled diesel engine, the air-cooled engine has fewer parts. The structure is simplified, the production process is simplified, and the production cost is reduced. In the past, the cylinder center distance of the air-cooled machine was generally larger than that of the water-cooled machine with the same cylinder diameter and displacement, so the length of the body was slightly longer than that of the water-cooled machine. Therefore, in general, the water-cooled machine is longer than the air-cooled machine. In recent years, with the development of air-cooled machines, the cylinder center distance is getting smaller and smaller. Therefore, the air-cooled machine and the water-cooled machine are getting closer and closer in terms of the cylinder center distance. This trend is making air-cooled models increasingly superior to water-cooled models in overall size.
3. The manufacturing process requirements of air-cooled diesel engines are higher than that of water-cooled diesel engines, and the requirements for heat resistance, wear resistance and expansion coefficient of the materials used are also higher. The air-cooled diesel engine is easy to start, economical to operate, and has strong adaptability to the environment, which is welcomed by the majority of users. Attention should be paid to the use: after starting, it should be idling at low speed for a while, the standby temperature will rise, and the oil pressure will be normal before putting into operation, so as to avoid the machine temperature rising too fast and damaging the parts; after stopping the operation, the engine should not be turned off immediately, and the diesel engine should be idling at medium and low speed. After a while, the standby temperature drops properly before turning off the flame; during operation, it should be noted that the temperature of the engine should not be too high. The air-cooled diesel engine completely relies on the powerful airflow generated by the fan to cool the body, and the working temperature does not exceed 120 degrees (higher than that of the water-cooled diesel engine). ), a cylinder pulling accident will occur if you are not careful during the operation.
Precautions for the use of air-cooled diesel engines
(1) Regularly check and adjust the tightness of the fan tape. If the tape is too tight, the load on the fan bearing will be too large, and the tape will be prone to early wear; if it is too loose, the tape will slip, reduce the air volume of the fan, cause the diesel engine to overheat, and the tape will be easily damaged. The correct tightness of the adhesive tape should ensure that there is no slippage when the diesel engine is started or turned off. Press the limb belt with the thumb with a force of 20~50N, and the drop distance is 10~15mm.
(2) Inject lubricating oil into the fan bearing and tensioner wheel (many air-cooled diesel engines are equipped with a tensioner wheel to adjust the tightness of the fan belt) on time to ensure that the bearing is well lubricated, rotates flexibly, No sticking.
(3) Prevent the diesel engine from overheating due to long idle time, insufficient fan speed, reduced air volume and poor cooling effect.
(4) The air guide cover must not be deformed, and it must be well sealed. Before starting, check whether the hook of the air hood is fastened. When running, be sure to cover the air hood, otherwise the direction and flow of the air will be changed, resulting in the return of hot air and reducing the cooling effect.
(5) It should be ensured that the wind deflector is not missing, damaged or lost to ensure the cooling effect.
(6) Eliminate oil leakage in time. The leaked oil will be blown onto the heat sink by the fan, adhere to the dust, hinder the ventilation between the heat sinks, and reduce the heat dissipation capacity. This can also cause the tape to slip, causing insufficient fan speed, premature corrosion damage or breakage of the tape.
(7) The long-term accumulation of oil stains on the surface of fan blades, cylinder liner cooling fins, cylinder head cooling fins, and oil radiators will seriously deteriorate the cooling effect. It should be flushed with diesel oil or compressed air in time. Dust and debris are blown out from the opposite direction of the cooling air flow.
(8) It is necessary to check frequently, maintain the fan tape breakage indication and install it straight, so as to detect the tape failure in time and prevent the occurrence of overheating.
(9) Always check the fuel supply advance angle (the fuel supply advance angle is too small, the temperature of the diesel engine will rise too quickly and overheat will occur). If it is found that it does not meet the requirements, it should be adjusted in time.
(10) After the diesel engine has been working for a period of time, the fuel injection quality of the fuel injector and the entire fuel injection pressure should be checked on the test bench to ensure that the fuel injector works well, and only because the fuel injector is not working properly. resulting in overheating of the diesel engine.
Is the air-cooled diesel engine durable?
Air-cooled will be affected by the change of ambient temperature, and the temperature changes greatly. high demands. Use only on special occasions. Not suitable for civilian use, the cost is too high.
