In winter, the biggest impact on the operation of the air compressor is the drop in temperature and the increase in the viscosity of the lubricating oil of the air compressor, which makes it difficult to start the air compressor after it has been shut down for a period of time.
The solution is to increase the temperature in the air compressor room through some heat preservation measures, and at the same time control the flow of circulating water to 1/3 of the original, so that the cooling effect of the oil cooler is reduced, so as to ensure that the oil temperature is not too low; Before starting the air compressor every morning, turn the pulley 4 to 5 times, and the temperature of the lubricating oil will naturally rise through mechanical friction.
In addition, cold weather will increase the water content in the lubricating oil and affect the service life of the lubricating oil. Therefore, it is recommended that the user appropriately shorten the replacement cycle. It should be noted that the same grade of lubricating oil cannot be used in winter and summer, especially in northern regions where the temperature difference varies greatly. Because the general lubricating oil has a characteristic that the viscosity decreases when the temperature is high, and the viscosity increases when the temperature is low. Therefore, the air compressor should choose the appropriate lubricating oil according to different seasons (mainly summer and winter), that is, according to different temperatures. There are three types of viscosity grades commonly used for screw air compressor oil: 32, 46, and 68.
For piston air compressors, the cylinder-filling part uses No. 19 air compressor oil in summer and No. 18 air compressor oil in winter; the crankshaft-connecting rod part can use No. 50 mechanical oil in summer, and No. 30 and No. 40 mechanical oil in winter. This will allow the air compressor to be better lubricated. Generally, single-acting small air compressors use No. 19 air compressor oil in summer and No. 13 air compressor oil in winter.
Due to lack of experience, some users often use the method of replacing the lubricating oil after the failure occurs. As a result, the air compressor whose lubricating oil has been replaced will fail again after a week or two of normal operation. Such frequent replacement has brought a great burden to the production cost.
When replacing the lubricating oil, in order to ensure the effect, you can start the air compressor and run it for one hour. The purpose of this is to restore the lubricating oil to the normal temperature, and make a simple operation for the entire air compressor system (especially the lubricating oil system). Complete and comprehensive cleaning, so adding new lubricating oil again can prolong its life and significantly improve the performance of the entire compression system.
The maintenance and operation of the engineering air compressor for outdoor use in winter cannot be ignored. Due to the low ambient temperature, the construction machinery air compressor is difficult to start. The main reasons are: the air temperature of the diesel-driven air compressor cylinder cannot reach the temperature required for startup when the cylinder is compressed, and the compressed air pressure in the cylinder is also significantly lower than the pressure required for startup; the optimal working temperature of the battery is 20-40 ℃ , As the ambient temperature decreases, its output capacity also decreases accordingly, resulting in a decrease in the power of the diesel air compressor starting system; when the ambient temperature is low, the viscosity of the oil increases, and the resistance between the frictional negatives increases, making the diesel air compressor The starting speed of the engine decreases, and at the same time, the viscosity of diesel oil increases, the quality of fuel injection atomization deteriorates, and the ignition lag period is prolonged; the air density and oxygen content in the air decrease with the increase of altitude. The more difficult the press is to start.
Under low temperature conditions, in order to ensure that all kinds of construction machinery can be put into use safely in cold conditions, daily maintenance should be done well, and a low temperature auxiliary starting system should be installed.
Several common low temperature starting methods: (1) Use diesel air compressor oil with good low temperature performance. This kind of air compressor oil has low low temperature viscosity, good lubrication between friction pairs, and low starting resistance, which is conducive to starting. ; (2) Use a battery with good low temperature performance, and if necessary, the battery can be insulated to ensure that it can be charged normally and has sufficient output current under low temperature conditions, thereby increasing the power of the starting system; (3) The flame is preheated to start; ( 4) Add cold starting fluid; (5) Circulating water heating system (also known as fuel heater heating system); in addition to the above preheating methods, hot water preheating method, steam preheating method and electric preheating method can also be used and other methods for low temperature start-up.
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