Air compressor running oil is no longer easy to change oil
Recently, the company received a customer phone feedback, a 75 kW imported high-end brand air compressor fuel consumption (commonly known as running oil, flying oil) is serious, one day to add a small barrel of oil, customer after-sales personnel to replace the oil separator (below After the abbreviation of oil, it is still running oil seriously. The simple way to replace the oil is not only the customer's daily oil consumption is reduced, but also the cost of replacing the oil, which causes the customer to complain.
When the technicians went to the site for processing, they found that the oil running fault was not caused by the quality of the oil. In addition to the quality of the oil, what other reasons would cause the air compressor to run oil?
Through many years of field experience, the author concluded that the main factors that cause air compressors to run oil are the following five categories:
1. Oil return system problems;
2. Primary separation of oil barrels;
3. Oil problem;
4, the user's use of working conditions;
5. Other hidden factors.
01
Oil return system problem
Problem performance: 1. The oil return check valve has foreign matter that is not smooth or completely blocked; 2. The oblique oil return pipe to the bottom of the oil is too large or the oil return pipe is broken when the oil pipe is installed; 3. When the flat oil return pipe is installed, insert The oil return port is blocked at the bottom of the oil; 4, the oil return pipe is broken. (Article source: "Compressor" magazine) The above problems will cause the oil not to return to the machine in time. The already condensed oil is taken up by the compressed air and taken away along with the separated compressed air to cause oil running.
Handling suggestions: 1. Clean the oil return check valve or replace the new oil return check valve; 2. Install the inclined oil return pipe to the bottom position of the oil groove bottom; 3. Polish the flat oil return pipe into a diagonal groove and insert it into the oil groove. The bottom of the tank; 4, replace the new return pipe.
If the machine does not return to the oil in time, the machine will run very fast, and if it is serious, the machine will stop at a high temperature. Therefore, it is recommended that the after-sales personnel carefully clean the oil return check valve and the return pipe and carefully install it during maintenance. It is important to emphasize here that the effective judgment of checking the oil return effect of the machine is the oil storage inside the oil center, and the less the better.
02
Primary separation of oil barrels
There are mainly unreasonable oil barrel size design, oil tank inlet diameter or angle mismatch, baffle board defect (such as trachoma, desoldering) and other issues:
1. The size design of the oil barrel is unreasonable, and the diameter or angle mismatch of the oil barrel inlet is mainly for the new machine. At present, most of the domestic air compressors are more reasonable in design. Only a small number of air compressor manufacturers have improved areas when they independently design and design oil and gas separation barrels. The unsatisfactory primary separation effect of the oil barrel will result in a high concentration of oil mist before the oil is divided. Only a reasonable flow rate, intake angle and scientific baffle design can achieve the ideal primary separation effect, otherwise the oil and gas mixture coming from the machine Will exceed the oil handling capacity and cause the machine to run oil.
Handling recommendations: The manufacturer improves the primary separation design and improves the primary separation.
2. The defect of the baffle is mainly for the old machine. After years of use, the air compressor will inevitably have some faults, and the baffle will cause defects. The baffle defect is a hidden deep oil problem, and it is also easy for our air compressors to ignore. Once the baffle is defective, the primary separation of the oil and gas mixture will not be effective, and the oil load will be exceeded, resulting in poor oil separation effect and oil running. The machine runs oil. Some after-sales workers simply think that it is the problem of oil. Repeatedly changing the oil, the machine still runs oil. This kind of treatment is a great waste of oil, oil and time.
Handling suggestions: To solve the problem, you need to find the problem point to solve this kind of oil problem quickly and efficiently.
03
Oil problem
Problem performance: mainly includes excessive fueling and oil selection.
1. Too much refueling is a newcomer in the industry or a new take-over machine. When the after-sales personnel are in maintenance, the amount of fuel added to the machine is not allowed. Exceeding the normal oil level, some of the oil is taken away with the airflow, causing the machine to run oil; there is also a hidden The deep problem is that the variable frequency air compressor with a large amount of fuel consumption consumes high fuel at low frequency. Because when the air compressor is running at low frequency, the motor speed is low, the amount of oil entering the machine is relatively small, the oil level of the oil barrel is too high, and some oil oil that is too high will be taken away with the airflow, resulting in high fuel consumption.
Handling suggestions: Consult the professional after-sales engineers of air compressor manufacturers, and observe the oil level mirror to properly refuel. Generally controlled at 1/2-2/3 of the oil sight glass, the frequency conversion machine should pay attention to the oil level when the low frequency operation is not too high.
2, the importance of air compressor oil to the air compressor system is also self-evident, it is recommended to select the type under the guidance of professional oil technology sales manufacturers.
04
User usage problem
Problem performance: including large step-down use and machine operating temperature.
1, a large step-down use. Due to the increased gas consumption in some factories, the exhaust pressure is much lower than the rated pressure of the air compressor when using the machine. For example, the rated pressure of an air compressor is 10 kg, but the actual gas pressure is only 5-6 kg or even lower. In this way, the air compressor is in a state of large-scale depressurization for a long time, and the rated pressure cannot be reached. At this time, under the condition that the intake air amount is constant, the exhaust pressure is greatly reduced, and the flow rate of the oil and gas mixture is too fast, so that the oil load is increased, causing the machine to run. oil.
Disposal suggestions: The air compressor is a professional and technical equipment, which should be used reasonably under the guidance of the engineer. For the case of inevitable large-scale pressure reduction, the fuel consumption can be appropriately reduced by custom-made special oil. (Article source: "Compressor" magazine)
2. Machine operating temperature. Some machines in the cleaning oil cooler or modified with a water-cooled oil cooler, the machine operating temperature drops more, resulting in long-term low-temperature operation of the machine, the compressed moisture inside the compressed air can not evaporate in time, attached to the oil Above the filter material, the structure of the oil filter material will be destroyed in the long run, resulting in oil running.
Handling recommendations: The machine's operating temperature is reasonably maintained at 80-90 degrees.
05
Other hidden deep factors
For some models such as differential pressure sensor collusion, the minimum pressure valve is not tightly sealed or opened in advance, and the oil cooler of the air compressor leaks oil.
1. The differential pressure sensor is colluded, and part of the oil and gas mixture before separation is directly removed without passing through the separation system, causing the machine to run oil.
2. The minimum pressure valve is not tightly sealed or opened in advance (the opening pressure of the minimum pressure valve of the air compressor is about 4 kg), then the time for establishing the internal pressure in the initial stage of the machine will be prolonged. Air oil mist concentration is high, and the flow rate is too fast, which will also cause the machine to run oil.
3. The air compressor oil cooler leaks into the air cooler, and the organic oil directly enters the air cooler and is accompanied by compressed air to the air outlet, causing the machine to run oil.
4. The water-cooled air compressor oil cooler leaks into the water cooler. Since the oil pressure of the engine oil is generally high, the water pressure is generally 2-3 kg/cm2, and the oil enters the cooling water passage system through the perforation, causing the machine to run oil.
Due to the wide variety of machines, there are differences in the reasons for running oil, and we need specific analysis when it comes to specific problems. The difficulty in running the oil problem in the machine is to accurately find the problem of running the oil in the machine, and then to solve the problem effectively.
