Vulnerable parts of screw air compressor need more attention

The air filter (Aircompressorfilter) of the air compressor is composed of an air filter assembly and a filter element. The outside is connected to the air inlet valve of the air compressor through a joint and a threaded pipe to filter dust, particles and other impurities in the air. Different air compressor models can choose the air filter to be installed according to the size of the air intake.

Fault appearance: filter clogging clogged air filter will make the air compressor energy loss, waste electricity, easy to be dust penetration. Excessive dust entering the air compressor will affect the service life of the air compressor oil and cause blockage of the oil and gas separator.

Troubleshooting: 1. The filter element is the core component of the filter. It is made of special materials and is a vulnerable part that requires special maintenance and maintenance.

2. When the filter has been working for a long time, the filter element has intercepted certain impurities, which will cause the pressure to increase and the flow to decrease. At this time, it needs to be cleaned in time. 3. When cleaning, be sure not to deform or damage the filter element.

The filter paper in the equipment is also one of the keys. The filter paper in the high-quality filter equipment usually uses superfine fiber paper filled with synthetic resin, which can effectively filter impurities and has strong dirt storage capacity. The equipment also has great requirements for the strength of the filter paper. Due to the large air flow, the strength of the filter paper can resist strong airflow, ensure the efficiency of filtration, and extend the service life of the equipment.

The pore size of the filter paper is about 10um, and the dust on the surface should be removed every 1000 hours. The method of removal is to use low-pressure air to blow the dust from the inside out. The air filter is equipped with a differential pressure controller. If the display panel shows that the air filter is blocked, it means that the air filter must be cleaned or replaced.

Oil filter

the oil filter is generally a paper filter, its function is to remove impurities in the oil such as metal particles, oil degradation, etc., the filtering accuracy is between 5um-10um, which has a protective effect on the bearing and the rotor.

Fault appearance: oil filter failure fault treatment: whether the oil filter should be replaced can be judged by its differential pressure indicator. If the differential pressure indicator is on, it means that the oil filter is blocked and must be replaced. The new machine needs to replace the oil and oil filter after 500 hours of operation for the first time, and then replace it according to the differential pressure indicator light. If the oil filter pressure difference is large and not replaced, it may lead to insufficient oil intake, and the exhaust high temperature jump at the same time due to insufficient oil will affect the bearing life.

The effective use time of the oil filter is determined by two factors: 1, the amount of impurities. When the oil filter's ability to adsorb impurities reaches its limit, the effective service life of the oil filter is reached;

2. Machine temperature and anti-carbonization ability of filter paper. When the machine is at high temperature and at room temperature, the service life of the oil filter is different. The high temperature model will greatly accelerate the carbonization of the filter paper and shorten the effective use time of the filter paper;

in addition, the effective use time of poor filter paper will be very short. Under normal circumstances, the effective filtration time of good quality oil filter is about 2000-2500 hours.

When the frequency conversion screw machine is used at low frequency for a long time, the temperature is usually low, the water in the oil barrel is more, and the waterproof ability of the filter paper is higher. When the frequency conversion screw machine is used at low frequency, the pressure of the oil circuit system will be low, and the oil filter must have low resistance and good air permeability.

Many people may think that the oil filter is based on interception and filtration. The higher the accuracy, the better the filtering effect. At the same time, they are worried that the filtering accuracy is too high and the oil filter is easy to block. However, some studies believe that this is actually a misunderstanding. The filtration accuracy of the oil filter has something to do with the filtration effect, but what really determines the filtration effect is not the filtration accuracy, but the adsorption capacity of the oil filter paper. The greater the dust holding capacity, the stronger the adsorption force and the better the filtering effect. Fiber filter paper filter effect is good, because the dust holding capacity is very large, strong adsorption capacity, strong anti carbonization ability. However, the price of fiber filter paper is very expensive, and the filter paper factory does not sell it, so it needs to be customized in large quantities. If the oil filter does not have a particularly large sales volume, it is difficult to customize fiber filter paper, which is the main reason why few people use fiber filter paper.

Oil core

the oil and gas separator filter element is made of multi-layer fine glass fiber, and the mist oil and gas contained in the compressed air can be almost completely filtered after passing through the oil separator. Under normal operation, the fine oil separator can be used for about 3000 hours.

The oil-water separation filter element is mainly designed for oil-water separation. It contains two types of filter elements, namely: coagulation filter element and separation filter element. Poor separation efficiency leads to large oil consumption and heavy oil content in compressed air, which affects the operation of back-end purification equipment and the failure of gas equipment to work normally. After blockage, the piezoresistance increases, resulting in an increase in the actual exhaust pressure of the unit and an increase in the energy consumption of the unit. After failure, the glass fiber filter separation material falls off and enters the oil, resulting in shortened service life of the oil filter element and abnormal wear of the main engine, it will also cause high temperature of the unit due to less oil, which may cause the head to lock in severe cases.

Fault appearance: blockage/damage/burning/poor separation effect Fault treatment: The pollution of the lubricating oil and the surrounding environment has a great impact on its life. If the environmental pollution is very serious, consider installing a front air filter.

1. blockage: oil core blockage will cause the air compressor motor current is too large. It is also possible that the oil core will be deformed due to excessive pressure, and the main engine will be locked when the motor is overloaded. In addition, excessive current will shorten the life of the contactor or cause a major accident due to contact burning. Generally, the screw air compressor will have a pressure gauge before the filter element. When the pressure difference between the pressure gauge before the filter element and the air supply pressure gauge reaches 0.08MPa, the oil core will be replaced.

2. DAMAGE. When the oil core is broken, it will be found that the oil consumption of the air compressor is very serious, and there will be a lot of oil in the gas storage tank and pipeline. In severe cases, directly discharge the air compressor oil when the drain valve of the air storage tank is discharged.

The main causes of this failure are:

(1) The oil core is not replaced on time;

(2) The oil core with poor quality is selected;

(3) The installation process did not follow the regulations, such as the oil core was inserted and broken when the oil return pipe was installed.

3. Burn. The burning of the oil core is not common during the operation of the air compressor, but it also happens occasionally. The main performance is that the filter net of the oil core is partially or completely carbonized, and even the metal shell of the oil core is burned.

Such failures are mainly:

(1) The quality of air compressor oil is poor;

(2) The quality of the oil core itself is too poor;

(3) When installing the oil core, there is no reliable connection between the shell of the oil core and the oil barrel, which cannot be grounded. When there is static electricity, the oil mist is ignited and the oil core is burned.

The separation effect is poor. The main performance is that the oil content of the compressed air is too large, which causes damage to the post-processing equipment and user equipment.

The main causes of this failure are:

(1) The quality of the oil core itself is too poor;

(2) the installation is not in accordance with the rules of operation.

Lubricating oil

the function of air compressor oil is to form a protective film between the critical points of the two friction screws to avoid contact between the screws, thereby buffering the friction, playing a lubricating effect, and reducing wear; in addition, it also has cooling, noise reduction, and sealing, Anti-rust and other functions.

Fault appearance: lubricating oil failure fault treatment: indeed, whether the new air compressor needs to replace the lubricating oil for 500 hours or every 4000 hours in the future, this is obtained under the standard environment. in the actual use of screw air compressor, many factors will affect the performance of lubricating oil, and because of this, we need to determine the replacement cycle according to the specific use environment.

So what factors will affect the screw air compressor lubricant replacement cycle? At present, we all agree that the main points are:

1. The quality of lubricating oil: the quality of lubricating oil will directly determine the cycle of its use. As long as it is a regular manufacturer's production, quality verification of qualified lubricants, can be replaced 4000 hours in a standard environment, and inferior lubricants replacement cycle is very short;

2. Air humidity: If the humidity in the air is greater, it means that the more moisture enters the air compressor, and the mixing of moisture and lubricating oil will cause the lubricating oil to deteriorate, which will affect its service life;

3. Impurities: including impurities that enter with the air and impurities that are generated by friction inside the air compressor. Impurities will contaminate the lubricating oil, resulting in its failure;

4. Acid and alkaline gas: There will be a large amount of acid and alkaline gas in the use environment of some air compressors, and its type of gas will also affect the working performance of the lubricating oil, resulting in the shortening of its service life.

Belt

the belt has good elasticity, can ease the impact and vibration in the work, smooth movement without noise. When the load is too large, the belt slips on the wheel, which can prevent damage to other parts and play a role of safety protection.

Fault appearance: poor belt elasticity fault treatment: after the air compressor is closed, the standby body temperature is cooled and there is no pressure, check the current state of the transmission belt. From the special structure of the screw air compressor, as for how to replace and adjust, but also according to its tight state. If there is no deformation and other serious problems, only need to be the corresponding optional bolts, and then make it meet the requirements of the situation can be. However, when it is damaged beyond repair, it must be replaced with a new one.

Among the precautions is that the tension must be consistent throughout the belt and be prepared to prevent slipping. After installation, test run for about 30 hours to observe the changes. In fact, the most important thing here is strength. Mastering this degree can avoid accidents such as disconnection.

If the replacement and adjustment of the screw air compressor drive belt can be done well, it is also beneficial to the work of the motor and other accessories, which virtually reduces the load. After completing all the steps, do a good job of fixing the head. Orderly, the implementation must be rigorous, can not make mistakes, many times the damage is caused by operational errors. Keep enough vigilance, make adequate preparations and adjust the data in time.

Solenoid valve

fault appearance: no action fault treatment: the failure of the solenoid valve on the screw air compressor will directly affect the action of the switching valve and the regulating valve. The common solenoid valve does not operate, which should be investigated from the following aspects:

1, screw air compressor solenoid valve connector loose or thread drop, solenoid valve shall not be electricity, can be fastened thread to solve the problem.

2. The solenoid valve coil of screw air compressor is burnt out. Solenoid valve coil burned out, can remove the solenoid valve wiring, measured with a multimeter, if the open circuit, the solenoid valve coil burned out. The reason is that the coil is affected with damp, which leads to poor insulation and magnetic leakage, resulting in excessive current in the coil and burning, thus avoiding rainwater from entering the solenoid valve. In addition, the tension spring is too hard, the reaction force is too large, the number of turns of the coil is too small, and the suction force is not enough to burn the coil. In case of urgent treatment, the manual button on the coil can be turned from the "0" position to the "1" position during normal operation to open the valve.

3. Solenoid valve of screw air compressor is stuck. The cooperation gap between the spool sleeve and the spool of the solenoid valve is very small (less than 0.008m), and it is usually installed in a single piece. When there is too little mechanical impurity or lubricating oil, it is easy to get stuck.

Disposal: available steel wire from the head hole into, make it back. The thorough solution is to remove the solenoid valve, remove the spool and spool sleeve, with CCI4 cleaning, making the spool in the valve sleeve action sensitive. When disassembling, attention should be paid to the installation sequence and external wiring orientation of each component so as to reinstall and wire correctly. It is also necessary to check whether the oil spray hole of the oil mist device is blocked and whether the lubricating oil is satisfied.

4. The solenoid valve of screw air compressor leaks. Leakage will form a lack of air pressure, making the opening and closing of the valve difficult, the reason is the sealing gasket damage or slide valve wear and the formation of several cavity blow-.

When checking the solenoid valve fault, the solenoid valve should be disposed of when it is out of power, directly replace the solenoid valve to burn the coil, or repair the leakage of the valve body.