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The role of air compressor plus frequency converter

In the current air compressor market, variable frequency screw air compressor, permanent magnet variable frequency screw air compressor, secondary compression permanent magnet variable frequency air compressor and other series are all used to control the frequency converter to adjust the frequency of the air compressor, stabilize the outlet pressure of the air compressor, and realize the automatic switching of the air compressor equipment frequency conversion。What is the role of air compressor and inverter？
Plus the function of frequency converter
First, the air compressor is generally selected according to the actual demand of cold capacity in design conditions，Under normal circumstances, the compressor is running all year round，Straddle both winter and summer extremes，Therefore, it is faced with a relatively complex external environment，And there is inevitably a certain deviation between the actual working condition and the design scheme，Therefore, the compressor power will have an appropriate surplus。
Second, at this stage, the energy regulation of air compressors mainly includes intermittent control operation, suction regulation, cylinder unloading, by-pass regulation and endless variable speed regulation。The intermittent operation of the air compressor is a more common operation mode, the ambient temperature is higher than the set temperature, the compressor will start to run, the ambient temperature drops below the set temperature, the compressor will stop working。This working mode is suitable for the situation where the ambient temperature is relatively stable and the load is not large, but in the actual use process, the ambient temperature is not constant at any time。In extreme weather and complex working environment, various production activities will cause changes in cold load, frequent temperature changes, frequent engine start and stop, which will cause a large waste of energy, but also easy to wear machine parts。
Third, the instantaneous current of the generator will spread over the power grid, increasing the fluctuation of the power grid, and the life of the compressor will also be affected。Therefore, frequency conversion technology has also been more widely used in air compressors。
Under certain conditions, the compressor refrigeration capacity is proportional to the mass flow rate, and the basic idea of frequency conversion regulation is to adjust the mass flow rate by changing the compressor motor speed, so as to change the total unit refrigeration capacity。

Therefore, it is not difficult to see that the air compressor plus frequency converter, the use of frequency converter to achieve effective regulation of the frequency of the air compressor, whether from the subjective or objective point of view, is very worthwhile。It not only saves resources to a certain extent, but also improves the work efficiency of the air compressor system, which can bring more benefits to enterprises。

2022.05.10

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Do the following four steps to avoid high air compressor temperature

Because the air compressor will produce a lot of heat in the process of operation, if the heat can not be dispersed in time, it may lead to high temperature failure of the air compressor, then the radiator is needed to heat and cool the air compressor。The air compressor radiator needs to be regularly maintained, otherwise the dust in the air duct is easy to be blocked. How to avoid the failure of the air compressor radiator, the following four "prevention" must be done.。
1, to prevent insufficient oil or lubricating oil deterioration
Lubricating oil is very important for the normal operation of air compressors, and has the role of lubrication, cooling and sealing。Less oil or lack of oil will lead to an increase in the internal friction of the air compressor, resulting in high temperature failure, and the use of lubricating oil has a certain replacement cycle, which needs to be replaced regularly to prevent the deterioration of lubricating oil and cause failure。
2, to prevent the air compressor working environment temperature is too high
The location of the air compressor installation should choose a well-ventilated, low temperature environment, can not be placed in the open air, can not be placed in a closed environment。If the ambient temperature is too high, the air compressor cannot dissipate heat, and the working load of the radiator increases。
3, prevent oil filter and air filter blockage
The compressed air of the air compressor contains a large number of dust impurities, if the oil filter and air filter are not cleaned in time, these particles will block the filter element, and the lubricating oil can not flow to the position that needs lubrication, resulting in an increase in the temperature of the air compressor, causing failure。
4, prevent temperature control valve failure

The temperature control valve is an important component to control the internal temperature of the air compressor, which can control the temperature of the air compressor in a certain reasonable range. If the temperature control valve fails, the temperature probe cannot monitor the temperature in real time, the air compressor is prone to high temperature failure。

2022.05.10

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Influence of cold weather on air compressor

Air compressor is an important component of PSA oxygen/nitrogen production system，Working in cold temperatures will have a great effect on it，Because of the low temperature，The lubricating oil in the air compressor circulation system will become viscous，Affect the service life of the machine，另外，Cold air into the air compressor will encounter heat to produce a lot of water vapor，The efficiency of the molecular sieve in the system decreased。In order to eliminate these problems, it is necessary to regulate the use of air compressors and reduce the impact of low temperatures on equipment。

1, pipeline cold protection because the water in the compressed air will be discharged through the automatic drainage valve, at low temperatures, it may freeze in the pipeline or other parts。Therefore, it is necessary to winterize the electronic drainage valve and piping system。

2. Keep the temperature of the machine room above zero. Use electric heater to raise and adjust the indoor temperature of the oxygen (nitrogen) machine room;Ensure that the ambient temperature of the equipment room is above 0 ° C。

3. Confirm that the working state of the automatic drainage valve is close to work or before the equipment needs to be shut down, fully open the drainage valve of the pipeline, gas storage tank, dryer, etc., and discharge the condensed water air before closing the valve。

4, shutdown time and space press management If you need to shut down the air separation system, you need to check that the gas emission is displayed as 0 on the display screen after the compressor is shut down.0bar, at the same time must close the valve。Then open the automatic drainage valve of the air compressor, gas storage tank and dryer, and close the air and condensate after completely empting。If it is a long shutdown, you must start once a week and repeat the above operations after 3 hours。

In short, in the low-temperature environment of the air separation equipment, we should always pay attention to the operating status of the air compressor, regularly carry out maintenance and maintenance, prevent the occurrence of air compressor failures, and ensure the smooth progress of production。

2022.05.25

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What aspects should be paid attention to in the work of piston air compressor

What aspects do the operators need to pay attention to when operating the piston air compressor, because the piston air compressor should always pay attention to its movement, so that a lot of failures can be avoided, and a lot of maintenance problems can be reduced in the later period
1. Lubrication:
According to the pressure gauge on the oil pipe of the circulating lubrication system and the temperature indication of the main bearing and moving part of the air compressor, attention should be paid to the air compressor oil supply of the gear pump;
Pay attention to the oil level of the air compressor crankcase;
Pay attention to the oil level in the bearing lubricated by the oil ring and the normal rotation of the oil ring;
Pay attention to the oil storage and dripping of the oil injector;
Pay attention to the temperature of the lubricating oil in the lubrication system of each moving part。
2. Cooling
Attention should be paid to the discharge and temperature of cooling water at all levels。
3, temperature, pressure indication
It should be noted that the temperature of compressed air after each stage of compression should not exceed 160 ° C;
It should be noted that the suction temperature at all levels after passing through the intercooler should not be more than 10℃ higher than the suction air temperature at the first level;
Pay attention to the distribution of pressure in each compression section is correct;
Pay attention to check whether the temperature indication of each friction part of the compressor is normal。
4. Motor
At any time through the ammeter, voltmeter, observe the working condition of the motor is normal。
5. Other aspects
Pay attention to the connection parts, fastening parts (screws, etc.) are safe and reliable, should not be loose;
Pay attention to the working condition of the transmission mechanism and listen to whether there is an abnormal sound;

For the air compressor in the small air separation equipment, it is also necessary to pay attention to the timely discharge of oil and water in each section。

2022.06.14

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