Maintenance of oil-injected twin-screw air compressor

1. After using it every day, it is necessary to check the oil level, exhaust temperature, exhaust pressure and other aspects of the screw air compressor to see if there is any abnormal situation. If the oil level is too low, it is necessary to add lubricating oil in time. In addition, it is necessary to check whether the machine has abnormal sound.

2. Before starting up the machine every day, it is necessary to open the separator and the drain valve respectively for the discharge of condensed water. In addition, it is necessary to check whether there is any leakage in various parts of the machinery and equipment, check whether the safety valve of the product can work normally, and check how the belt of the product is worn.

It is necessary to clean the screw air compressor regularly, thoroughly clean the condenser of the product, and also need to check the reliability of the safety valve of the product regularly.

Fault detection:

1, screw air compressor failure phenomenon: unit fuel consumption or compressed air oil content

the reason for this failure is that there is too much cooling dose. The correct position should be observed when the unit is loaded. At this time, the oil level should not be higher than half. Blockage of oil return pipe will also cause screw air compressor failure. Failure to meet the requirements of installation of oil return pipe will cause excessive oil consumption of screw air compressor. Exhaust pressure is too low during unit operation; Fracture of oil separation core will lead to failure of screw air compressor; Damage to internal partition cylinder; Deteriolation of coolant.

2, screw air compressor failure phenomenon: unit pressure is low

the reason for this failure is that the actual gas consumption is greater than the output gas of the unit. Screw air compressor deflation and intake valve failure (cannot be closed during loading); The transmission system is abnormal, the ambient temperature is too high, and the air filter is blocked. Load solenoid valve (1SV) failure; The minimum pressure valve is stuck; There is leakage in the user pipe network. Failure of screw air compressor such as pressure sensor, pressure gauge and pressure switch will lead to low pressure; pressure sensor or pressure gauge input hose leaks;

3. Screw air compressor failure phenomenon: fan motor overload

fan deformation: fan motor failure; fan motor thermal relay failure (aging); loose wiring; cooler blockage; large exhaust resistance.

Screw air compressor maintenance:

1. Intake air filter element

the air filter is a component that filters out air dust and dirt, and the filtered clean air enters the compression cavity of the screw rotor for compression. Because the internal clearance of the screw machine only allows particles within 15u to be filtered out. If the air filter element is blocked and damaged, a large amount of particles larger than 15u will enter the screw machine to circulate, which will not only greatly shorten the service life of the oil filter element and the oil fine separation core, but also cause a large amount of particles to directly enter the bearing cavity, accelerate the bearing wear and increase the rotor gap. The compression efficiency is reduced, and even the rotor is boring and seized.

2. Oil filter

after the new machine runs for 500 hours for the first time, the oil core should be replaced, and the oil filter element should be removed with a special wrench. It is better to add screw oil before installing the new filter element. The filter element seal should be screwed back to the oil filter seat with both hands and tightened firmly. It is recommended to replace the new filter element every 1500-2000 hours. It is best to replace the oil filter element at the same time when changing the oil. When the environment is bad, the replacement cycle should be shortened. It is strictly prohibited to use the oil filter element beyond the time limit. Otherwise, due to the serious blockage of the filter element and the pressure difference exceeding the bearing limit of the bypass valve, the bypass valve will automatically open, and a large amount of dirt and particles will directly enter the screw main engine, causing serious consequences. Diesel screw machine diesel engine oil filter and diesel filter replacement should follow the diesel engine maintenance requirements, the replacement method is similar to the screw oil core.

3. Oil and gas separator

the oil-gas separator is a component that separates the screw lubricating oil from the compressed air. Under normal operation, the service life of the oil-gas separator is about 3000 hours, but the quality of the lubricating oil and the filtration accuracy of the air have a huge impact on its life. It can be seen that the maintenance and replacement cycle of the air filter element must be shortened in the harsh use environment, and even the installation of a front air filter is considered. The oil and gas separator must be replaced when it expires or the pressure difference between the front and rear exceeds 0.12Mpa. Otherwise, the motor will be overloaded and the oil and gas separator will be damaged and oil will run. Replacement method: Remove the control pipe joints installed on the oil and gas barrel cover. Take out the oil return pipe extending into the oil and gas barrel on the cover of the oil and gas barrel, and remove the fastening bolt of the upper cover of the oil and gas barrel. Remove the upper cover of the oil and gas barrel and take out the oil. Remove the asbestos pads and dirt stuck to the upper cover. Install the new oil and gas separator, pay attention to the upper and lower asbestos pads must be stapled, and the asbestos pads must be neatly arranged when pressing, otherwise it will cause pad punching. Install the upper cover plate, oil return pipe and each control pipe according to the original sample, and check whether there is any leakage.

4. Oil replacement

the quality of screw oil has a decisive influence on the performance of oil injection screw machine. Good oil has good oxidation stability, rapid separation, good foam cleaning, high viscosity and good corrosion resistance. Therefore, users must use pure screw oil for the company.

The first oil replacement will be carried out after the new machine runs in for 500 hours, and the new oil will be replaced every 2000 hours after operation. It is best to change the oil filter at the same time. Use in harsh environments to shorten the replacement cycle. Replacement method: start the air compressor to run for 5 minutes, so that the oil temperature rose to more than 50 degrees Celsius, oil viscosity decreased. Stop running. When there is 0.1Mpa pressure in the oil and gas barrel, open the oil drain valve at the bottom of the oil and gas barrel and connect the oil storage tank. The oil drain valve should be opened slowly to prevent the oil with pressure and temperature from splashing and hurting people. Close the oil drain valve after the lubricating oil becomes dripping. Unscrew the oil filter element, drain all the lubricating oil in each pipeline at the same time, and replace it with a new oil filter element. Open the screw plug of the oil filler, inject new oil to make the oil level within the range of the oil mark scale line, tighten the screw plug of the oil filler, and check for leakage. Lubricating oil must be checked frequently during use. When it is found that the oil level line is too low, new oil should be added in time. Condensate water must also be discharged frequently during use of lubricating oil. Generally, it is discharged once a week, and it should be discharged 2-3 days in high temperature climate. Once. Shut down for more than 4 hours, open the oil drain valve when there is no pressure in the oil and gas barrel, drain the condensed water, and quickly close the valve when organic oil flows out. It is strictly prohibited to mix different brands of lubricating oil, and avoid overdue use of lubricating oil. Otherwise, the quality of lubricating oil will decline, the lubrication will be poor, and the flash point will be reduced, which will easily cause high temperature shutdown and cause spontaneous combustion of oil.