At present, it has entered late December. Many areas in the north have been exposed to icy conditions for a long time, and the outdoor temperature has been below 0°C for a long time. How to ensure stable operation of air compressor in cold weather
It is worth the user's attention. Today, the editor will teach you how to make the air compressor survive the winter smoothly. The winter maintenance of the air compressor is worth learning.
Winter maintenance
The biggest obstacle to the operation of air compressors in winter is low temperature. Low temperature will cause the viscosity of lubricating oil to increase. Once the air compressor is shut down, it will be difficult to start for a period of time.
We can avoid this problem by ensuring the temperature of the air compressor room. At the same time, the circulating water flow rate should be modified to 1/3 of the original. This can reduce the cooling effect of the cooler.
And to ensure that the lubricating oil temperature is not too low. In addition, before starting the air compressor every morning, we can rotate the pulley 4-5 times to improve the problem of lubricating oil through mechanical friction.
Lubricant replacement instructions
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 winter and summer cannot
Use lubricating oil of the same brand, especially in northern areas where the temperature difference varies greatly. Because the general lubricating oil has a characteristic that the viscosity decreases under the condition of high temperature, but under the condition of low temperature
Under these conditions, the viscosity increases. Therefore, the air compressor should choose the appropriate lubricating oil according to different seasons (mainly summer and winter), that is, according to different temperatures. Commonly used viscosity brand of screw air compressor oil
There are three types of numbers: 32, 46, and 68.
For piston air compressors, the cylinder-packing part uses No. 19 air compressor oil in summer and No. 18 air compressor oil in winter; the crankshaft-connecting rod part uses No. 50 machine oil in summer, and No. 30 and No. 40 machines in winter.
Mechanical oil, so that the air compressor can get better lubrication. 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 adopted the method of replacing the lubricant after the failure occurred. As a result, the air compressor with the replaced lubricant was in normal operation for a week or two, and the failure reappeared. Such as
This frequent replacement brings a great burden to the production cost.
When changing the lubricating oil, in order to ensure the effect, the air compressor can be started and run for one hour. The purpose of this is to restore the lubricating oil to the normal temperature, and to the entire air compressor system (especially
Lubricating oil system) do a simple and comprehensive cleaning, so that adding new lubricating oil again can extend its life and significantly improve the performance of the entire compression system.
The maintenance and operation of engineering air compressors used outdoors in winter cannot be ignored. Due to the low ambient temperature, it is difficult to start the construction machinery air compressor. The main reason is: diesel-driven air compressor cylinder pressure
At the end of the contraction, the air temperature cannot reach the temperature required for start-up, and the compressed air pressure in the cylinder is also significantly lower than the pressure required for start-up; the best working temperature of the battery is 20-40℃.
When the ambient temperature decreases, its output capacity also decreases correspondingly, resulting in a decrease in the power of the diesel air compressor starting system; when the ambient temperature is low, the oil viscosity increases, and the resistance between the frictional negative factors increases, making
The starting speed of the diesel air compressor decreases, and at the same time, the viscosity of diesel increases, the quality of fuel injection atomization becomes worse, and the ignition lag period is prolonged; the air density and oxygen content in the air change with the increase in altitude.
Decrease, the higher the altitude, the more difficult it is to start the diesel air compressor.
In low temperature conditions, in order to ensure that all types of construction machinery can be safely put into use in cold conditions, daily maintenance should be done, and it is best to install a low temperature auxiliary starting system.
Common low temperature start method
1. Choose diesel air compressor oil with good low-temperature performance. This type of air compressor oil has low low-temperature viscosity, good lubrication between friction pairs, and low starting resistance, which is good for starting. ；
2. Adopt a battery with good low temperature performance, and heat the battery when necessary 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. Flame preheating start;
4. Add cold start fluid;
5. Circulating water heating system (also called fuel heater heating system); in addition to the above preheating methods, various methods such as hot water preheating, steam preheating, and electric preheating can also be used for low-temperature start.
move.
Improve computer room environment and working conditions
First of all, if conditions permit, it is recommended to put the air compressor indoors or build a temporary tent in winter as much as possible. This will not only prevent the temperature from getting too low, but also improve the air quality at the air compressor inlet.
Maintain the air compressor room temperature above zero.
Secondly, pay attention to keeping the environment clean and tidy. In particular, pay attention to the fact that there is no accumulation of water around the equipment and the ground of the station building to prevent ice and slippage, which may cause the operator to fall and be injured.
Operating Instructions for Air Compressor in Winter
Before the air compressor is used, we must open the side cover to observe whether the oil thickens or freezes. If so, the oil must be heated first. Even if the oil is not frozen, when the unit is just turned on in winter, the unit
The oil viscosity of each lubrication part is relatively high, coupled with the relatively low voltage of some outdoor work sites, it is easy to cause relatively difficult startup when the machine is just turned on. The general method is to first set the unit for 2-3 laps, and start the air compressor
Run the machine 3-4 times, and then load the machine after running it for a period of time. The current of the air compressor can be measured with a multimeter after its normal operation. Normally, it is within 5% of the rated current of the motor,
If it exceeds 10% of the normal current, there is a problem with the unit or the voltage is low, it should be shut down for inspection, otherwise the motor will easily heat up and burn out, and additional electricity will be wasted. An important reason for the high current is the beginning of oil content
Blocked.
After the shutdown in winter, you must pay attention to venting all gas, sewage, and water, and venting the water, gas, and oil in various pipes and air bags. This is because the temperature of the unit is relatively high when the unit is working in winter.
The temperature is low, and a large amount of condensate will be generated after the air is cooled. There are various control pipelines, intercoolers and air bags, which are easy to block the control pipelines and intercoolers, and the air bags will burst and crack.
At the same time, after the cold air enters the air compressor, it will produce a lot of water vapor when it encounters high temperatures, which will increase the burden of the air compressor's post-processing, so it is necessary to frequently discharge the water in the post-processing equipment.
Compressed air enters the production area through pipes and is used by users. Some of these pipes are buried in the ground, and some exposed pipes are erected in the air. Exposed pipes in cold weather may be caused by low temperature
Some moisture will be generated, and some will even affect the normal use of users due to the increase of moisture.
For example, in the laser cutting machine industry, if the compressed air contains high oil and water content, it will affect the accuracy of the cutting process. In the mining industry, humid air compressor compressed air may not affect the aerodynamics
The normal use of the tool will affect the strength of the pneumatic tool during operation.
Therefore, when off work in winter or when the equipment is shut down, drain valves such as pipes, gas storage tanks, and dryers should be fully opened, and the condensed water should be drained before closing the valves.